This sanding block was inspired by this design : https://www.thingiverse.com/thing:1515755 by Kent Wollesen. I added one curve and a right angle, and changed the the way the paper is kept in place by using a spring. The size of the block is 12x4x2cm (4.7x1.5x0.75 inches). The size of the pieces of paper is 23x4cm (9x1.5 inches).