The descision to go with a 100 Watt 10,000 hour tube is what determined the size of the machine. As the tube is so much bigger than a 40 Watt tube, I had to use different mounts. I just posted
http://www.thingiverse.com/thing:20350 which solves that problem.
- In case you are wondering, the 3D printer you see there is the whole reason I'm building the laser.