Step 7: Lining the Interior
Felt is traditional and comes in all sorts of colors, but I used a cheap doormat because it is stronger than regular felt.
(Rubber-backed doormats would be too thick for this application; check the dollar store first!)
The interior dimensions of my box were 60 mm deep x 130 mm across on each side. The drawing I've scanned here shows how those measurements relate to cuts made on the lining material. Be sure to measure all sides in case your box is not square!
Cut out your material in a square including the length of the box's sides and depth (130 + 60 + 60 = 250 mm).
Mark squares with sides the same length as your box's depth on each corner with crayon and cut-out.
Fold-in sides C and D, then A and B over those as indicated in the drawing.
Insert the folded material in the box making sure the center "square" of material is flush with the bottom.
Glue folded sections of material to the sides of the box in the order: A > B > C > D. Sides C and D will end up overlaping sides A and B at the corners. It is important to glue the sides but not the bottom, and that the bottom is FLUSH before gluing; wrinkles or bumps of glue under your rolling surface may cause unwanted crits!
Some, if not all, sides will also stick-out over the top of the walls due to the thickness of the material. Trim these sides carefully and re-apply glue if needed.