Chuck Handpiece 3/8 UMF
thingiverse
I found these handpieces for larger chucks on eBay - they're perfect for using a drill by hand. They come equipped with 1-10mm drills and a 3/8 UNF thread. What's great about this setup is that it allows you to manually operate a drill when needed. Printing this handpiece was a straightforward process. I used PLA, which proved strong enough to hold its shape. My printer settings included a layer height of 0.2mm for the entire piece, except for the thread area - there, I opted for a finer 0.1mm layer height as recommended by the Prusa Slicer software.
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