The addition of a magnet in these wrench holders keeps the wrench in place better when used in a rolling tool cabinet.
I used 12mm x 2.5mm magnets. They hold pretty well. It could be adapted for larger magnets, but I wouldn't recommend smaller.
If the magnets are loose, use a little superglue. Magnets get installed from the back after printing.
I use #10 pan head screws on my toolgrid, so I made a bigger slot for screw clearance.
The FreeCAD file is included if you want to customize it. The main dimensions are in a VarSet:
Magnet D will set the magnet hole diameter (leave clearance)
width sets the width of the block
wrench Width sets the diameter of the wrench groove
The walls and cams in the photo can be found at https://www.printables.com/model/1462719-toolgrid-walls-corners-cam-and-tee
Inspired by https://makerworld.com/en/models/1743313-wrench-spanner-holders-tool-grid-no-gaps
The author marked this model as their own original creation.