thingiverse
this is a simple padlock I designed in tinkercad, It's fully functional and only requires a bobby pin and an inkpen spring to work. I've seen a lot of locks on here that require parts not everyone has, this lock was designed to be easy to make with parts you can get at your local convenient store.
I tried drawing some quick instructions on how to place the bobby pin, they're up with the rest of the pics, if you have any problems let me know.
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.