Clips for holding a glass sheet on the Printrbot.Print off 4 clips, these were designed to work with the heat bed on a Printrbot+ with an 8" square 1/8 sheet of borosilicate glass from McMaster-Carr.The print had some problems so the clip needed a lot of fine-tuning. After I get my calibration issue fixed I'll see if the clip itself actually needs some adjustment as well.