Roller Back stopper for PiBurnWe recently introduced new backs topper with roller instead of wheel for our PiBurn Rotary Attachment. Compatible with V3, V4 and V This new stopper has two improvements over the old one: Tall roller profile now can make contact with object that has opening in it (for example if you are engraving a bottle or a wine glass that's been turned around 180) It can be adjusted further back to allow more of your object surface to be on the back wheels