a full size screwdriver handle to hold bit with a hole in the side to put a magnet sized 8mm diameter and 2.75mm thick. it has to be forced in but will stay put. 

if you need modification for other sized magnet you can ask for it and i will do it when i have time and upload it.

the design is close to a wera screwdriver i have lying around.

printed in petg with 4 lines and 60% for high strengh, but im thinking its a bit overkill.