I bought these 3 deburring tools, they came with 1 handle, so I made 2 more handles.

I found a screwdriver that I liked the feel of in my hand and copied it.

I printed this at 20% (fine for the small chamfers I'm using), if you want to apply some torque, I would increase to at least 60%.

You will have to rotate 90 degrees to the hex end to print (sorry I'm still not sure how to rotate in Freecad before saving).