I'm trying to upload a Thing-a-day this February. makerblock.com/2011/02/makerblock-thing-a-day/I've put the opto-endstops back into my Cupcake! I had taken the endstops out because they weren't necessary for normal safe operation and tended to get a little cumbersome. However, in the hopes of creating some auto-homing GCode, I've re-installed them. At best I had a very jury rigged endstop trigger. This is intended as a workable fixture.Day 6: Cupcake CNC Optoendstop Trigger for X Minimum http://www.thingiverse.com/thing:6191 Day 5: Things That Cannot Be Unseen. thingiverse.com/thing:6097 Day 4: Extruder to Stepper mounting plate. thingiverse.com/thing:6106 Day 3: A shelving unit bracket. thingiverse.com/thing:6001 Day 2: A mirror bracket. thingiverse.com/thing:6000 BONUS THING: A Helen Weight. thingiverse.com/thing:6024 Day 1: A bathroom hook. thingiverse.com/thing:5999Use the secondary revision. The first one doesn't work quite as well.