for my fidget spinner I had to use two blocks of woods. If I use a single piece of wood only top of view of the CAD would be printed and not the bottom piece.
My drawing contains a 3 inch by 1 inch height gear that faced inward, 3 gears that were about a inch in diameter, and a gear attachment. The function of this object when assembled is three gears are placed on the gear attachment. The gear attachment allows each gear to move freely, then this placed inside of the bigger gear. This larger gear's purpose to stay in place, while using your hand to rotate the gear attachment, which force the other gears to rotate at the opposite direction.
For the laser cutter, I’ve selected a piece of art of mine that I have done last year. It is called the last art because it is latest drawing I’ve done. So, I draw a piece of wood that is 6in by 4 inches and ⅕ inches thick and stable my art work.