Gridfinity blocks to hold rafter/speed squares.  There are two sizes so you can place one on top of the other to save space.  Used for my Empire squares.  Two of the blocks in each set are beveled so you can lift the corner of the top square up to access anything underneath and make it easier to remove.  Instead of magnets I am using double sided tape to keep my blocks in place so I can get the maximum height out of my drawers and it works really well.  If the tape wears out from moving the blocks around I can easily replace them.

Prusa MK4 with Input Shaper

02.mm Layer Height (only because Input Shaper is pretty fast even at that height)

Printed Solid Jessie PLA Red Ice