Tiny screwdriver handle with magnet bit retention.

This is a mini screwdriver handle inspired by the “Micro Screwdriwer Handle” by @pilim_ (not remixed becasue the license doesn't permit). This one adds a 6x3 magnet to retain the bit rather then using a friction fit. It makes it easer to insert and remove bits while still having good retention. (a 6x2 magnet would also work)Magnets are a tight friction fit and you may need to scale if you print in something other than PLA (they were a good fit with the profile I uploaded when printed on my A1 Mini and X1C) Boost MeBoosts are always appreciated but not expected.