If i leave the precision at 0,0000 and snap at 0,1 and set the units to mm, I get the unwanted snapping! Setting the units to meter, keeping 0,0000 and snap at 0,1 it "works"... To summarize: Precision:0.01 Snap:0.1 Draw 2 // lines L1=1.00”units” and L2=0.98”units” along the x-axis Draw L3 from end of line L1 straight up along z-axis With m (meter) units all is OK! With mm (millimeter) units it screw it up!!!!! So that is why I set units to meters, export to .obj, import into slicing software for 3D printing. If somebody can explain this behavior? Because I still have other artifacts while merging different groups and “outer shell” them or do intersections, flat faces get “distorted” !!! [image: 6jAu_CC37.jpg] [image: fPCy_CC38.jpg]