Finger Hex Wrench with embedded magnet

thingiverse

I liked RonaldWalters' original design, but I wanted to address some issues that needed improvement. * Bottom-fillets on parts are problematic - they should never be used as you're instantly creating a nasty overhang which will either print poorly or require supports. Instead, I added a chamfer and then created a fillet from the chamfer so it still looks nice but the overhang is never more than 45 degrees (and mostly less). * The indentation at the end required unnecessary supports even though they didn't provide any real help. * The magnet needed to be glued in place and could easily be pulled out. Instead, I created a pocket for an 8mm x 3mm magnet - a size that's readily available and provides enough pull to hold the bit securely through several mm of filament. Just set your slicer to initiate a filament/color change at the top of the pocket and while the print is paused, simply insert the magnet and then resume printing. Note that I prefer replacing the M600 filament-change code with an X/Y move (so the head is clear of the print) and then M0 (use pause), so you don't need to do a filament unload/reload but a regular filament change works just fine too.