Needed a basic corner guide for gluing, couldn't find the right shape on Thingivee so made my own, thus the "L" shape. Holes fits those smaller 7 inch quick release clamps to hold in position if needed. I had a hard time removing my print from my Makerbot bed. Added 2 small removable pi to force it to print the fit few laye on supports vs. raft, else just flip over and print as normal. Please enjoy. Thanks.