Corner Cutter (Scalpel Blade ; Covid Plastic Cover Cutter)
thingiverse
I am one of the makers who manufacture Covid-19 Face shields and need a jig to cut the 4-corners of every plastic sheets. It required to prevent any risk leaking gloves due to cutting edges. To use it, you need a skateboard bearing, a ball and a scalpel blade. I can customize it on demand (radius changes). You can also copy it on OnShape : https://cad.onshape.com/documents/d1f0bd03cf6ee59ab621ec93/w/9c55c23ef3f83cae6578449b/e/b8b9d044590645626582759a
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