Okay,, been 3D cutting for several days now.. I've proven two things to myself. I started out no clamps. not tape.. I'm tough, no need.. After cutting three pieces,, hands cramping, fingers really sore from trying to stop the thing when it started bucking and bouncing... I thought, were is that clamp I built for this? It was right were I thought I had put it, that had to be an omen of some kind.. then try tape, just in case it really helps... I have always been dubious about the tape claims... So the new me using clamp and tape... I have cut two+ in the time it took me to do one before. The tape does help. Must lub something because I could cut faster. The camp so much more control... So take the time to save time and pain. Use whatever clamp works best for you, and do use packing tape.