About this 3D model

This is a set of Pentomino pieces in a handy carry case with swivel top. I designed it a few years ago after reading 'Chasing Vermeer' by Blue Balliett in which the main character solves a crime with the help of pentominoes. It's Nintendo DS size and a clear cover prevents the pieces from falling out. Later I made a batch of larger sets for our Maths department. There are 2 layers of 3mm and 1 layer of 2mm acrylic. The surround of the Top layer was bonded to the Base layer with thin acrylic cement, Tensol 7. An M3 lock-nut is inserted from the very bottom and held in place by an M3 countersunk fastener that also allows the clear cover to swivel. One of the files is in *.dtd format for direct use in UK schools where Techsoft 2D Design is widely used to laser cut.