Item Holder (wall mounted)

This is a wall mounted holder for flat items. I'm using it to hold packages of sandpaper but it can hold anything rectangular, notepads, magazines, etc.. Print CornerX2.stl twice, InsertCornerA.stl and InsertCornerB.stl are mirror images of one another. Arrange them so items can be inserted from the top or one of the sides. The depth will leave 21 mm between the inside of the holder and the wall. The screw holes are 3.6mm in diameter.