Knob - 3/8" inch
thingiverse
The knob accommodates a 3/8" nut or bolt with ease. The original design allows for adjustable dimensions, enabling users to resize it to fit bolts of various sizes to some extent. Check out the original model here: https://cad.onshape.com/documents/4239ab9baf7ac7283d3f54d4/w/73ca030cee3d54ea36d31362/e/f8eab7bd6335ddfc7d68f796 I printed the knobs at a layer thickness of 0.2mm and the caps at 0.1mm to achieve optimal results. To account for shrinkage, I scaled the X and Y axes by 107%, but uniform scaling could also be used with similar effectiveness.
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