Precision Driver Adapter (4mm & 3.5mm)
thingiverse
This is a precision bit driver adapter I fabricated in Tinkercad to connect my precise bits to my power screwdriver, giving me the capability to utilize both my 4mm set of bits and my 3.5mm bits from my reversible screwdriver. The inner hole was conically shaped to accommodate shorter 4mm bits as well as longer 3.5mm bits. I chamfered the rear end and added a void along the neck, allowing it to work with driver extensions having ball bearing retainers. I created this on my Printrbot Simple Metal printer with 20% infill density and it's remarkably strong.
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