My Flashforge guider 2 used these and I would have to use glue for TPU, and Silk would degrade them so fast that after about a month of heavy silk use I would have to recondition it with acetone to make it stick to silk again but I could only do that 1 or 2 times before it would start to crack the surface. Let me tell you getting these off with a heat gun to replace them and using goo gone on the adhesive left behind on the spring steel was probably the single most frustrating thing ive ever done in relation to 3d printing. Build Tape×5（pcs） For Flashforge Guider 2/2S 3D Printer