Here are 2 sets of Tangram pieces. One comes in a handy carry case with swivel top, the other set without. That one is intended to be held in a dedicated PolyPropylene box but I have included a box for the swivel case set also. Both should be packed with the puzzles & solutions shown in one of the images.

One of the files is in *.dtd format for direct use in UK schools where Techsoft 2D Design is widely used to laser cut.

I have always loved Tangrams and after making my Pentominoes in a Case, thingiverse.com/thing:5008 , I also made a Tangram classroom set for our Maths department and then this pocket version to give away. It's 100 mm x 100 mm (4" x 4") in 3.2 mm (1/8") acrylic.

Swivel top version:

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.

Non- swivel top version:

This is constructed much in the same way but instead of an aluminium registration pin here 4 square(-ish) dowels are used. In the photo they are in the colours representing the 'houses' within the school. I cut strips of acrylic with the same width as the thickness. They turned out tapezoidal in section due to the kerf of the laser. Heat distortion didn't make things easier either. I didn't get around to trying stock cylindrical acrylic.

Avoid using clear acrylics where you intend to bond as it will show.