Parts lists · Printable Enclosure Latches

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1. Perimeter band (V-band) clamp
2. Cam lever on steel stud
3. Swing bolt + knob/wing nut
4. Plain lid screws (baseline)
5. Captive screw + Belleville stack
6. Vise-action (lift-and-turn) screw-cam
7. Over-center draw latch, screw-adjustable hook
8. Over-center latch, spring-loaded
9. Threaded lid / screw cap
10. Quarter-turn compression latch
11. Multi-point rod latch
12. Wedge / slide bolt
13. Bayonet / twist lock
14. Over-center draw latch, fixed hook, steel pins
15. Double-throw (case) latch
16. Rotary cam lock
17. Printed cam-hook latch
18. Stainless wire bail latch
19. Fully printed over-center latch
20. Snap-fit / compliant catch

What each of the 20 mechanisms is made of, in force-rank order: the printed parts with their STL files, the hardware to buy, with sizes and an example shop link, and the features printed into the box or lid. The lists follow the print-ready parts in print/. Threaded anchors are M3 square nuts (DIN 562), not heat-set inserts, even where the research notes mention inserts. Stainless means A2 or A4 (316) for outdoor use; printed means ASA unless the row says otherwise. Everything to buy is also on one page, with links, in the shopping list.

1. Perimeter band (V-band) clamp

Per closure: 2 parts to print, 1 item to buy and the TPU 85A seal. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Container with V-flange	1	Print	ASA, upright; the flange has a seal groove and a raised land that the lid lands on (the hard stop)	container.stl
Lid with V-flange	1	Print	ASA, upside down; flange ring 8.5 × 6.5 mm in section	lid.stl
Seal ring	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in the flange groove; the band squeezes it 0.8 mm	seal-ring.stl
Band clamp	1	Buy	Stainless band clamp for about 120 mm: ideally a constant-tension T-bolt clamp (a spring keeps the band tight as the seal creeps); a worm-drive hose clamp works for a test	Inox Store

Print files: print/01-perimeter-band-clamp.

2. Cam lever on steel stud

Per latch: 2 parts to print, 9 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Hinge bracket	1	Print	ASA, flat on its back; ears 7 mm thick, 5.2 mm hinge bore	bracket.stl
Cam lever	1	Print	ASA, on its side (pin axis vertical) with supports under the upper disc, 100 % infill; 4.2 mm bore	cam-lever.stl
Bracket screws †	4	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	4	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Hinge bolt	1	Buy	M5 × 30 stainless screw with an M5 nyloc nut, through the bracket ears and the eye	M5 screw · M5 nyloc
Eye bolt	1	Buy	M5 × 50 A2/A4 eye bolt (DIN 444); the eye at most 12 mm across and 6.5 mm thick	Schraubenhandel24
Disc springs	4	Buy	Stainless disc springs for M5 (DIN 2093, 10 × 5.2 mm), stacked in series	RVS Edelstahl
Contact plate	1	Buy	Stainless washer 15–18 mm across (DIN 9021 or DIN 440 for M5), or a 1.5–2 mm steel plate; the cam rolls on it	Inox Store
Fork head	1	Buy	M5 × 15 hex standoff, female both ends (8 mm across flats), or a coupling nut; cross-drilled 4.2 mm, 3 mm from one end, for the lever bolt	Grobotronics
Jam nut	1	Buy	M5 A2/A4 nut (DIN 934); locks the fork head, whose height sets the clamp force	Grobotronics
Lever bolt	1	Buy	M4 × 20 stainless screw with an M4 nyloc nut; the lever turns on it	M4 screw · M4 nyloc
Slotted lid tab	1	Printed with the lid	Slot 6.4 mm wide, open at the end; flat seat for the springs	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	4	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/02-cam-lever-steel-stud.

Step-by-step assembly: how to assemble.

3. Swing bolt + knob/wing nut

Per latch: 2 parts to print, 7 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Clevis bracket	1	Print	ASA, flat on its back; ears 7 mm thick, 5.2 mm bore	clevis-bracket.stl
Knob	1	Print	ASA, upside down; hex pocket for the nyloc nut	knob.stl
Bracket screws †	4	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	4	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Hinge bolt	1	Buy	M5 × 30 stainless screw with an M5 nyloc nut	M5 screw · M5 nyloc
Swing bolt	1	Buy	M5 × 50 A2/A4 eye bolt (DIN 444); the eye at most 13 mm across and 7.5 mm thick	Schraubenhandel24
Knob nut †	1	Buy	M5 A2/A4 nyloc nut, pressed into the knob	Grobotronics
Disc springs	4	Buy	Stainless disc springs for M5 (DIN 2093, 10 × 5.2 mm); keep the force up as the seal creeps (optional, recommended)	RVS Edelstahl
Washer †	1	Buy	M5 stainless washer, 15 mm across (DIN 9021) if you can get it; spreads the load on the lid tab	Inox Store
Slotted lid tab	1	Printed with the lid	Slot 6.4 mm wide with a flat seat	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	4	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/03-swing-bolt-wing-nut.

Step-by-step assembly: how to assemble.

4. Plain lid screws (baseline)

Per screw: 3 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Screw	1	Buy	M3 × 14 A2/A4 socket screw (DIN 912)	Grobotronics
Square nut	1	Buy	M3 square nut (DIN 562), pushed into the side slot in the boss	Grobotronics
Washer †	1	Buy	M3 stainless washer, 9 mm across (DIN 9021) if you can get it	Inox Store
Screw boss	1	Printed with the box	12 mm wide; the nut slot (5.7 × 2.0 mm) opens on the outside, with 4 mm of plastic above the nut; 100 % infill	box-coupon.stl
Lid tab with clearance hole	1	Printed with the lid	3.4 mm hole, counterbored 9.6 × 0.8 mm for the washer	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/04-baseline-screws.

5. Captive screw + Belleville stack

Per latch: 1 part to print, 6 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Knob	1	Print	ASA, flat; the screw head slides into the side slot	knob.stl
Screw	1	Buy	M3 × 20 A2/A4 socket screw (DIN 912); its knurled head is pressed and glued into the knob	Grobotronics
Square nut	1	Buy	M3 square nut (DIN 562), pushed into the side slot in the boss	Grobotronics
Disc springs	5	Buy	Stainless disc springs for M3 (DIN 2093, 8 × 3.2 mm); together ¼–½ as stiff as the seal	RVS Edelstahl
Thrust washer	1	Buy	M3 stainless washer at least as wide as the springs	Inox Store
Spacer sleeve	1	Buy	Brass M3 spacer, 6 mm across, 5 mm long, sanded to 4.6 mm; sits in the lid hole and stops the springs	Grobotronics
Retainer †	1	Buy	3 × 1 mm O-ring from the kit, rolled onto the screw just below the spacer sleeve, so the screw stays in the lid when it's open; it tucks into a pocket in the boss	Grobotronics
Screw boss	1	Printed with the box	Nut slot 5.7 × 2.0 mm opening on the outside, with 4 mm of plastic above the nut; a 4.4 mm pocket on top for the retainer O-ring	box-coupon.stl
Lid tab with hole	1	Printed with the lid	6.4 mm hole for the spacer sleeve	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/05-captive-screw-spring-stack.

Step-by-step assembly: how to assemble.

6. Vise-action (lift-and-turn) screw-cam

Per latch: 3 parts to print, 5 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Handle with hub	1	Print	ASA, upside down; M5 nut pocket in the top, two lugs underneath	handle.stl
Ramp cup	1	Print	ASA, upright; two 1.5 mm ramps over 90°, a 30° flat dwell and a stop; closes clockwise	ramp-cup.stl
Keeper with lip	1	Print	ASA, on its end so the lip bends along the layers	keeper.stl
Stud	1	Buy	M5 × 40 stainless socket screw, head down under the pawl	Grobotronics
Pawl	1	Buy	2 mm stainless plate, 7.6 × 11.6 mm with rounded ends and a 5.3 mm hole, cut by hand	Edelstahl-Lechner
Nuts	3	Buy	M5 A2/A4 nuts: one clamps the pawl against the screw head, one sits in the handle pocket and one jams it	Grobotronics
Keeper screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Lid tab with hole and pegs	1	Printed with the lid	6 mm hole for the stud and two 2 mm pegs that locate the ramp cup	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/06-vise-action-screw-cam.

Step-by-step assembly: how to assemble.

7. Over-center draw latch, screw-adjustable hook

Per latch: 3 parts to print, 6 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Base	1	Print	ASA, flat on its back; ears with 4.25 mm bores	base.stl
Lever	1	Print	ASA, on its side with supports under the upper cheek; 3.9 mm press holes for the pins	lever.stl
Hook	1	Print	ASA, upside down; sits on the keeper (a steel hook is stronger)	hook.stl
Base screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Pivot pins	2	Buy	4 mm steel pins, 8 mm long, cut from 4 mm shaft; pressed into the lever cheeks, they turn in the base	Grobotronics
Link pin	1	Buy	4 mm steel pin, 14 mm long; pressed through both cheeks	Grobotronics
Eye bolt	1	Buy	M4 × 40 A2/A4 eye bolt (DIN 444); the eye at most 10 mm across and 5.5 mm thick	Amazon.de
Nyloc nut and washer	1	Buy	M4 A2/A4 nyloc nut and washer on top of the hook; turning it sets the take-up	M4 nyloc · M4 screw
Keeper	1	Printed with the lid	Ledge on the lid edge, 18 × 6 mm, loaded in compression	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/07-oc-adjustable-screw-hook.

Step-by-step assembly: how to assemble.

8. Over-center latch, spring-loaded

Per latch: 4 parts to print, 7 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Base	1	Print	ASA, flat on its back; ears with 4.25 mm bores	base.stl
Lever	1	Print	ASA, on its side with supports under the upper cheek; 3.9 mm press holes for the pins	lever.stl
Hook	1	Print	ASA, upside down; sits on the keeper and carries the spring carriage	hook.stl
Spring carriage	1	Print	ASA, upright; holds the 12.5 × 25 mm die spring and stops it after 5.5 mm of travel, drain hole	spring-carriage.stl
Base screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Pivot pins	2	Buy	4 mm steel pins, 8 mm long, cut from 4 mm shaft; pressed into the lever cheeks, they turn in the base	Grobotronics
Link pin	1	Buy	4 mm steel pin, 14 mm long; pressed through both cheeks	Grobotronics
Eye rod	1	Buy	M4 × 70 A2/A4 eye bolt (DIN 444 style), at least 66 mm from the eye's centre to the end, or M4 threaded rod with a bent eye	Amazon.de
Compression spring	1	Buy	ISO 10243 die spring for a 12.5 mm hole, 25 mm long, yellow (extra heavy, about 58 N/mm); squeezed 3.4 mm when closed	Berner & Straller
Nyloc nut and washer	1	Buy	M4 A2/A4 nyloc nut, with a 15 mm washer under it (M5 DIN 9021) that lands on the carriage rim if the spring is squeezed too far	M4 nyloc · washer
Keeper	1	Printed with the lid	Ledge on the lid edge, 18 × 6 mm, loaded in compression	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.2 mm tall: 1.2 mm below the free seal, so the spring sets the squeeze and the lid only reaches them once the seal has set	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the spring squeezes it about 0.9 mm	seal-strip.stl

Print files: print/08-oc-spring-loaded-compensating.

9. Threaded lid / screw cap

Per closure: 2 parts to print, 2 items to buy and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Jar with thread	1	Print	ASA, upright; 3 mm pitch thread, 3 turns; the inner lip on the rim is the hard stop	jar.stl
Screw cap	1	Print	ASA, upside down; internal thread, 30 grip ribs	cap.stl
Seal ring	1	Seal (TPU 85A)	TPU 85A, 1.4 × 3.2 mm, on the jar rim outside the lip; 0.8 mm squeeze	seal-ring.stl
Slip washer (optional) †	1	Buy	PTFE or PE, between the seal and the turning cap	S-Polytec
Lock (optional) †	1	Buy	M4 A4 spring plunger, or a printed pawl	Leschhorn

Print files: print/09-threaded-lid-cap.

10. Quarter-turn compression latch

Part	Qty	Type	What to use	File or shop
Housing	1	Print	ASA, flange down; a bushing in the lid tab	housing.stl
Wing knob	1	Print	ASA, flat; hex pocket for an M5 nut	knob.stl
Ramp keeper	1	Print	ASA, on its end; the underside ramps down 1.5 mm to a flat dwell, with a stop block	ramp-keeper.stl
Screw †	1	Buy	M5 × 40 A2/A4 socket screw (DIN 912), head under the pawl	Grobotronics
Pawl	1	Buy	2 mm stainless plate, 7 × 12.3 mm with a rounded end and a 5.3 mm hole, cut by hand	Edelstahl-Lechner
Nuts †	3	Buy	M5 A2/A4 nuts: one clamps the pawl against the screw head, one sits in the knob's pocket and one jams it	Grobotronics
Keeper screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Lid tab with hole	1	Printed with the lid	8.4 mm hole for the housing	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/10-quarter-turn-compression.

11. Multi-point rod latch

Per door: 3 parts to print, 4 items to buy, 2 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Handle with shaft	1	Print	ASA, grip face down; 80 mm lever, 10 mm shaft with a flat	handle.stl
Hub cam	1	Print	ASA, flat; two spiral slots move the rods 6 mm in a 90° turn	hub-cam.stl
Latch points	2	Print	ASA, on its side; 12° face that draws the door in 1.3 mm	latch-point.stl
Rod guides	2	Printed with the lid	Blocks on the door's inner face with 5.4 mm holes	door-coupon.stl
Frame keepers	2	Printed with the box	Lug with a 12° face beside a 6 mm rod hole, in the frame	frame-coupon.stl
Rods	2	Buy	5 mm steel rod, about 95 mm long, bent 90° with a 6 mm leg at the hub end	Grobotronics
Shaft O-ring †	1	Buy	O-ring 10 × 2 mm (in the NBR kit), in the counterbore round the shaft, outside the door	Grobotronics
Hub screw †	1	Buy	M3 × 8 socket screw with a washer, into a square nut in the shaft	M3 screw · washer · square nut
Clamp screws †	2	Buy	M3 × 8 socket screws into square nuts; clamp the latch points to the rods	M3 screw · square nut
Door gasket	1	Seal (TPU 85A)	TPU 85A rib round the door; design it into your door and frame

Print files: print/11-multi-point-rod-latch.

12. Wedge / slide bolt

Per latch: 2 parts to print, 3 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Guide	1	Print	ASA, flat on its back; pocket for the wedge tip and a bridge outboard of the catch	guide.stl
Wedge	1	Print	ASA, on its side so both sliding faces are smooth walls; 1:10 taper	wedge.stl
Catch block	1	Printed with the lid	Hangs from the lid tab: 26 mm wide, 7.5 mm thick, with a 10.8 mm window whose floor matches the taper	lid-coupon.stl
Guide screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Detent (optional) †	1	Buy	M4 A4 spring plunger	Leschhorn
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/12-wedge-slide-bolt.

13. Bayonet / twist lock

Part	Qty	Type	What to use	File or shop
Container with lugs	1	Print	ASA, upright; 3 lugs, each with a stop, a flat dwell and a ramp that draws the lid down 1.2 mm	can.stl
Bayonet lid	1	Print	ASA, upside down; 3 inward lugs	lid.stl
Seal ring	1	Seal (TPU 85A)	TPU 85A, 1.4 × 3.2 mm, on the rim outside the lip; 0.8 mm squeeze	seal-ring.stl
Detent (optional) †	1	Buy	M4 A4 spring plunger or ball detent	Leschhorn
Slip washer (optional) †	1	Buy	PTFE or PE, under the seal ring	S-Polytec

Print files: print/13-bayonet-twist-lock.

14. Over-center draw latch, fixed hook, steel pins

Per latch: 3 parts to print, 4 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Base	1	Print	ASA, flat on its back; ears with 4.25 mm bores	base.stl
Lever	1	Print	ASA, on its side with supports under the upper cheek; 3.9 mm press holes for the pins	lever.stl
Hook link	1	Print	ASA, lying on its side; neck 7.2 × 5.7 mm	hook-link.stl
Base screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Pivot pins	2	Buy	4 mm steel pins, 8 mm long, cut from 4 mm shaft; pressed into the lever cheeks, they turn in the base	Grobotronics
Link pin	1	Buy	4 mm steel pin, 14 mm long; pressed through both cheeks	Grobotronics
Keeper	1	Printed with the lid	Ledge on the lid edge, 18 × 6 mm, loaded in compression	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/14-oc-fixed-hook-pinned.

15. Double-throw (case) latch

Per latch: 1 part to print, 4 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Hinge bracket	1	Print	ASA, flat on its back; match the ear gap and bore to the latch you buy	hinge-bracket.stl
Butterfly latch	1	Buy	Stamped A2/A4 stainless latch (outer plate and inner lever), about 22 mm wide	Amazon.de
Hinge pin	1	Buy	3 mm steel pin, 31 mm long	Grobotronics
Bracket screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Keeper lip	1	Printed with the lid	Lip on the lid edge; an M4 stainless screw makes it adjustable	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/15-double-throw-butterfly.

16. Rotary cam lock

Part	Qty	Type	What to use	File or shop
Cam lock body with knob	1	Print	ASA, knob down; a hex on the end of the shank drives the tongue	cam-lock-body.stl
Tongue	1	Print	ASA, flat; 8 mm thick, 14 mm wide, reaching 8.8 mm from the shaft, with a hex socket for the body	tongue.stl
Keeper	1	Print	ASA, on its end; the ledge tapers 0.8 mm over the last part of the turn, with a stop block	keeper.stl
Screw, washer and nyloc nut †	1	Buy	M5 × 25 A2/A4 socket screw (DIN 912) from the top, with a washer and nyloc nut under the tongue	M5 screw · washer · M5 nyloc
Keeper screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Detent (optional) †	1	Buy	M4 A4 spring plunger	Leschhorn
Lid tab with hole	1	Printed with the lid	8.5 mm hole for the body	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/16-rotary-cam-lock-simple.

17. Printed cam-hook latch

Part	Qty	Type	What to use	File or shop
Mount with ears	1	Print	ASA, flat on its back; 4.25 mm bore	mount.stl
Cam-hook lever	1	Print	ASA, on its side, 100 % infill	cam-hook-lever.stl
Pivot bolt	1	Buy	M4 × 25 stainless screw with an M4 nyloc nut	M4 screw · M4 nyloc
Mount screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Catch peg	1	Printed with the lid	Peg on two posts on the lid tab; an M3 screw in it makes the catch adjustable	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/17-cam-hook-printed.

18. Stainless wire bail latch

Part	Qty	Type	What to use	File or shop
Wire retainers	2	Print	ASA, on end; blind 3.3 mm hole for the wire (the left one is retainer-left.stl)	retainer-right.stl
Lever wire	1	Buy	3 mm stainless wire, about 110 mm, bent to shape	Gutekunst
Bail	1	Buy	3 mm stainless wire, about 45 mm, bent to shape	Gutekunst
Retainer screws †	4	Buy	M3 × 16 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	4	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Catch ridge	1	Printed with the lid	Ridge on the lid tab with a groove for the bail	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	4	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/18-bail-wire-latch.

19. Fully printed over-center latch

Per latch: 5 parts to print, 2 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Base	1	Print	ASA, flat on its back; ears with 4.25 mm bores	base.stl
Lever	1	Print	ASA, on its side with supports under the upper cheek	lever.stl
Pivot pins	2	Print	ASA, lying on the flat; glued into the lever cheeks	pivot-pin.stl
Axle pin †	1	Print	ASA, lying on the flat; pressed through the cheeks and the loop	axle-pin.stl
Loop link	1	Print	ASA, on its side; bars 2.2 × 3.3 mm	loop-link.stl
Base screws †	2	Buy	M3 × 10 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), dropped down the channels in the box wall	Grobotronics
Keeper with horn	1	Printed with the lid	Ledge on the lid edge with a 2.2 mm horn the loop hooks over	lid-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Nut channels	2	Printed with the box	Inside pillar with a 5.7 × 2.0 mm channel per nut, open on the rim outside the seal; blind 3.4 mm screw holes, so no path into the box	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/19-oc-fully-printed.

20. Snap-fit / compliant catch

Per latch: 1 part to print, 2 items to buy, 3 features printed into the box or lid and the TPU 85A seal. Parts marked † are not drawn in the 3D model. In the 3D gallery you can click a part to see where it sits. The last column links the print file, or an example of the part in a shop (see the shopping list).

Part	Qty	Type	What to use	File or shop
Snap arm	1	Print	ASA, on its side so it flexes along the layers; 20 mm wide, 2.6 mm thick, about 24 mm long	snap-arm.stl
Arm screws †	2	Buy	M3 × 8 A2/A4 socket screws (DIN 912)	Grobotronics
Square nuts †	2	Buy	M3 square nuts (DIN 562), pushed into the boss on the lid	Grobotronics
Screw boss	1	Printed with the lid	20 × 10 × 6 mm block on the lid with two nut slots; the holes stop short of the lid	lid-coupon.stl
Catch ledge	1	Printed with the box	On the box wall, with a lead-in ramp	box-coupon.stl
Hard stops	2	Printed with the box	Pads on the rim either side of the latch, 1.6 mm tall: 0.8 mm below the free seal	box-coupon.stl
Seal strip	1	Seal (TPU 85A)	TPU 85A, 1.5 × 3.4 mm, in a 1.8 × 1.0 mm groove in the rim; the latch squeezes it 0.8 mm	seal-strip.stl

Print files: print/20-snap-fit-compliant.