Coaster for a beagleboard

After shorting out yet another board I decided to make some coasters to protect my revision B and revision C beagleboards. It took me a few hours to get the hang of openscad and then tweak the dimensions to account for ABS shrinkage, but it's finally working.

With a 3mm edge thickness this maxed out my buildarea using a makergear bighead, the stock nozzle might have a bit more clearance.

Support for the slightly bigger beagleboard-xM will follow later once I have countersunk the bolts on m