I downloaded the multi-board plates and knew I was on m/y own for items to push fit/screw in as the ones they made just didn't work. This item is one I use to hold dremel sanding drums in grits of 80, 120, 150, 240, 320, 400, 600 as embossed on the front but can hold any size grit. The larger size drum pieces go in the back, medium size in the middle, and small ones in the front. There are 3 spots for each size of drum. I did 15% infill with PLA silk filament but any filament will work.