I'm printing some parts on my Flashforge Creator Pro 2016 and keep seeing this weird banding issue around any walls that have holes in them. It also seems to happen when the outline of an object changes, where detail either sticks out further or cuts inward. It only lasts from the bottom of the hole to the top, and stretches almost all the way around the part. Photos attached. This is not the only part this happens on, any with a change in outline with respect to Z axis result in this defect.
I've tried just about everything I can think of:
Decreasing acceleration settings
Changing print speeds (typically use 3000mm/min)
Printing outlines at ridiculously slow speeds (300mm/min)
Changing number of outlines
Decreasing movement speeds (typically use 4000-6000mm/min)
Changing the order of outlines (inside to out and vice versa)
Changing extrusion multiplier (0.94 calculated for this filament)
Changing outline overlap (20 – 30%)
Varying nozzle temperature (190 – 205C)
Tightening belts
Changing retraction settings (1 – 2mm) and restart distances
Turning off “force retraction between layers” and other ooze control options
Closing the printer door
Opening the printer door and removing the side panels
Changing infill pattern and density (hex/rectilinear 20 – 50%)
Enabling / disabling supports
Turning off “adjust print speed for layers below X seconds”
Other details:
Filament is Hatchbox PLA
Glass bed heated to 60C with hairspray applied (but was still present when using the stock tape that came with the printer)
Micro Swiss hardened nozzle (not all metal hotend, the version for PTFE tubing)
Simplify3D (obviously)
Printer is located in my garage (but defect is still present when printer is in my house)
Printing at 0.2mm layer height
0.4mm nozzle with 0.4mm extrusion width set
Side cooling fan is set to turn on at layer 3
I took a look at the Gcode output in an online viewer and it looks to be doing what it is supposed to
Nothing seems to reduce or eliminate the defect. Any help is greatly appreciated.