Mirka Deros Systeiner insert

Mirka Deros systeiner organizer to hold 150 mm and 120 mm sanding papers. With additional prints you can stack more 150 mm holders on top of each other. With magnets inserted and glued to each recessed holes, the holders won't slide during transportation. Magnets that fit the recesses are 8x3 mm. 

The bottom “grid” is modeled after the original holder for the sander. The print in the pictures is an older model and was revised after. The model is split in two so you are able to print it with regular 225 x 225 mm build plate. The model has 0.3 mm tolerance on the dovetail, magnet recess and the peg. 0.3 mm tolerance is quite generous and should work on most printers. 

I might model other inserts than the 2, most probably not.