Summary Evezor is a SCARA class robot and today we etched the letter U into glass See a video of the making of here https://www.youtube.com/watch?v=F23ElfldXa4 Our tool post, once again, was just a hunk of 2X4. Then we used a hose clamp to secure the rotary tool to the tool post. We used a diamond bit to do the glass etching and some lightly soapy water as coolant. Find out more about our arm at http://www.evezor.com See our other projects we've made with our arm Hot Wire Foam Cutting http://www.thingiverse.com/thing:2194430