The idea is to make my allen wrenches easy to get to and not have to yank on them to pull them out of the holster that came with the set.
The hex's have a built in .25mm additional wiggle room, but I recommend printing at least with a 0.12 resolution.
Here are the magnets and the cheap hex set I used:
I did something similar with my screwdrivers.
The author marked this model as their own original creation.