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This is a short tutorial to make a keychain with any 3D model using PrusaSlicer. It works with forks as well, like Bambu Studio and OrcaSlicer.
The main goal is to add a curved hole to any model, so a keychain ring can be fitted.
1. On the object list, right-click and select "Add negative volume" → "Gallery"
2. Select the "Torus"
3. Adjust the Torus size as needed
(usually 10 mm for standard keychain rings, which are 8 x 1 mm)
4. Rotate the Torus and move it to the desired place (be careful not to intersect articulations)
5. Slice, and check that the hole is ok
That's it!
For keychains, I strongly recommend this kind of hole instead of printing a ring. Rings are very fragile and won't last long.
Oh, and if you need different Torus proportions, you can create your own (Tinkercad, Meshmixer, Fusion360, Blender... any CAD/modelling software) and then add it to PrusaSlicer.
Hope you find it useful!
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