Precision screwdriver with magnetic bit & screw retention. Bearing-smooth twisting with knurled fine control shaft and ribbed upper shaft for more torque. Model and dimensions inspired by the LTT precision screwdriver. Compatible with standard 4mm bits.

Printing Recommendations

• Layer height: 0.1-0.2mm
• Nozzle size: 0.4mm
• Material: PETG
• Supports: None

Assembly

1. Use a <6mm hex key press 2 stacked 6mm magnets from the top of Shaft.stl. The last ~7mm should be a tight press fit with positive stop. Use a small dab of superglue, if needed.
2. Press the bearing into the top of Shaft.stl. The bearing should sit at the same height as the plastic print. If it doesn't (ie. you use a textured bed), use a knife to trim the plastic flush with the top of the bearing.  Use a small dab of superglue, if needed.
3. Press one of TopX.Xmm.stl into the bearing. Should be a tight press fit with positive stop. Use a small dab of superglue, if needed.

BOM:

• 1x 625 bearing
• 6mm magnet(s) (I use 2x 6x3mm)
• 1x Shaft.stl
• 1x Top-X.Xmm.stl (try 5.2 first for a tight fit)