Othello (aka Reversi) mk. 1

Othello is a game I've liked for a long time. In the game, there's an 8x8 board and 64 pieces. Each piece is white on one side and black on the other.

Here's a design I made for a simple board and some pieces, etched on one side, plain on the other.

http://www.thingiverse.com/thing:124002

My first attempt at cutting a set of pieces worked, but I'm not satisfied.
I'm seeing two problems:

• The laser is firing slightly late when starting an arc path (hence the unetched gaps)
• The (old) air compressor wasn't working well and allowed some pieces to get scorched (this should now be fixed)