Magnetic screw driver for 4mm bits (6x3mm magnet)

Remixed to use 6mmx3mm magnets popular with Voron projects. I made a double magnet option to increase magnetic effect. The change was marginal.

My version does not use a heatset insert, just self tap an m3 screw. 

Graham's model has a 3.9mm hole to be used with a heatset insert in the handle. The hole is big enough for an m4 screw if you don't have an insert. I've made an m4 butt to go along with it. 

Tip: Only print the top section if you want to check tolerances , and pause function for magnet insertion (drag model below the bed).

Changed magnet to the 6mm diameter x 3mm height magnets

Included M4 screw butt