I received my LulzBot Mini printer yesterday and was pleased to find that the rocktopus printed perfectly without issue using the supplied HIPS filament. This is my first 3D printer and I was very impressed with how well that first print turned out.
Today I attempted my first print with ABS: a case for my beaglebone that I found on Thingiverse (http://www.thingiverse.com/thing:471661).
I am using Gizmo Dorks branded ABS filament and have an acrylic enclosure installed to try to minimize temperature fluctuations. I started out with the standard Lulzbot ABS settings in Cura, but cancelled the print after seeing wavy lines in the first few layers of the print. It appeared that the nozzle was coming into contact with previously extruded lines, causing a sort of inconsistent banding to appear across the print. I measured my filament and increased the filament size setting in Cura from 2.85 to 2.95mm. This appeared to reduce the amount of banding in the second print, but didn’t solve the issue completely.
The bigger issue was noticed later when the printer began work on the walls of the case. After just a few layers the nozzle began to run into previously printed layers in certain areas of the print, causing the print head to bump along over this increasingly clumpy region. Is this issue caused by over-extrusion or something else? I have attached a photo of the finished print and some videos to better illustrate the issues I am experiencing. Any ideas on how I might solve this?
Thanks for the help!