thanks, that works better then making the shell 1 mm thick... never had that issue with Slic3r, but, so far i am liking MatterSlicer - the bed leveling works... i was having a nightmare with Repeiter firmware getting it to map the bed. Got a Zprobe, but, could never get it just right. I used the 7 point, then the 13 point on MatterControl, and i can lay down a flat 1st layer all round. My Rostock Max is 2 1/2 years old, and now that i have updated the arms, got an all metal E3D head, and now switched to MatterControl, it is working better then it ever did - like i got a whole brand new printer