If anyone is still curious, I’m getting ready to start working on the cutter again. School has been a pain in the neck, but it looks like I’ll have a little bit of free time now.
I ordered an ATmega328P to see if I could get it to work in my Arduino Diecemilla board. No such luck. But I picked up a reasonably-priced Arduino Uno from the local Micro Center and have uploaded the Teacup firmware to it. Now I just have to hook everything up to the new board and get started on the mechanical issues.
The Y-axis linear actuator might be a bad idea. At the very least, the motor mount needs to be replaced with something that doesn’t have nearly as much play.