Precision Bit Adapter - 4mm bit to 1/4" (Regular drill bit Size)
thingiverse
I created this so that I can rapidly open up small electronics with a handheld power screwdriver. closedbottom4mmaadapter4.stl is tight on the bit. closedbottom4mmadapter3.stl is somewhat loose on the bit. Both of these ^^^^^ were printed using a .4 mm nozzle. closedbottom4mmadapter6.stl prints well with this one if you have a .2 mm nozzle. This appears to be an absolutely perfect fit for me. I'd love it if you would let me know how things turn out. Instructions: Use closedbottom4mmaadapter4.stl when the bit fits snugly, but not too tightly. When using closedbottom4mmadapter3.stl, ensure that there's a slight gap between the bit and the nozzle. For best results with small electronics, try printing with closedbottom4mmadapter6.stl on your .2 mm nozzle printer.
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