Stop backpack zips being opened in crowds
Hook the two zip pulls of a backpack pocket into the narrowed throats of this S link: the pocket can no longer be slid open quietly in a crowd, but your own fingers unhook it in a second.
Print flat in PETG; print a few.
Filament: at most about 2.0 g of PLA printed solid (roughly $0.04 at $20 per kg); normal infill uses less.
To get the files, open it in the generator and choose File › Download STL (one file per part) or Download 3MF (every part on one plate).
The backpack zip pull linker model measures 42 × 22 × 9 mm (width × depth × height). You can change every size in the free SO3D.xyz generator before you download it.
Usually not. Print flat in PETG; print a few.
At most about 2.0 g of PLA (1.6 cm³ printed solid), roughly $0.04 of filament at $20 per kg. Normal infill uses less.
Yes. Open it in the SO3D.xyz generator (free, in your browser), change the size, walls, dividers, holes, text or anything else, then download it as STL or 3MF for your slicer.
Change the size, walls, dividers, holes and labels of the backpack zip pull linker model in your browser, then download it for your printer. Free, no CAD needed.
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