Thanks for your suggestions. I will work my way through them. Not sure how to know at what point to pause Pronterface (eg at outline or at infill but guess I will figure it out.. Also not sure what is meant by back-lash, The slipping of the steppe rmotor drive shaft? The "jumping" of threads? I can't see why that would happen on both sides of the z-drive simultaneously. But, then, I am pretby Peter Kinnon - New Zealand RepRap User Group
Are there any group activities in the vicinity of Papakura? Meet-ups, etc. Or 3D printer users who would be interested in arranging something?by Peter Kinnon - New Zealand RepRap User Group
Hi, I am a newbie so please excuse naivety. I have acquired a Prusa Mendel. Produces very good quality prints except that the first (bottom) few millimeters are consistently missing. It is not simply a scaling issue (steps per mm) as horizontal holes are a corresponding distance off center. Same thing occurs whether STL is downloaded from Thingiverse or prepared myself on Tinkercad. So presumby Peter Kinnon - New Zealand RepRap User Group