The printed part that gets into the frame and holds magnets have two recessed standoffs, both of which have different length.
Using the included step file and upper magnet holder the first have 5.3mm from the top of extrusion to the end of recess and the other standoff on the same printed part have just 4.8mm.
I noticed in my build that if I tighten the bolt holding those the magnet holder tilts and make things not fit well. To solve this i checked my Misumi 2020s and they are 6mm deep so I decided to just use extrude tool and extend those to be 6mm and while doing so I noticed that they are not only too short for BOM Misumi frame, they are also uneven length on both ends!