I just bought the lulzbot 4 recently. I am having trouble printing a small cube (20 x 20 x 10 mm) using HIPS. the problem is at the top right corner of the cube (when looking from top-view on to the print bed) is always a mess. The printing pattern is that it always lift the z at the lower left corner then move to the top right corner to start extrude new layer. And small mess looked like a sticky ball will start build up at the top right corner but the other corners are fine.
I thought the problem is that it extrude too much after it retract, so I increase the retract value from default of 2 to 3.5mm but it is still a mess. please help
20mm-box.gcode (75.1 KB)
my fast_HIPS_no-support_pt35nzl_pt22layer.ini (3.28 KB)