I consistently see underextrusion in the form of small gaps in solid infill and pretty consistent gaps between layers in the outer wall (little to no bonding). If I had to guess, I’d say the gaps are ~0.1mm wide.
My printer is a Wanhao Duplicator i3 Plus MkII running ADVi3++ v4.0.5. I’m printing PLA on the stock build plate and I use 205C/60C and a speed of 30mm/s. I slice with Simplify3D. I’ve tried Cura but it decided to hold the print head really far from the build plate and I haven’t bothered to figure out why.
I’ve tried calibrating the extruder a couple of times and I ended up with a steps/mm of 144.7 (which seems way off given Wanhao’s manual says it should be 90).
I also calibrated Simplify 3D’s extrusion multiplier. I measured the wall of a cube printed in vase mode with an extrusion width of 0.48mm to be ~0.49mm (with a micrometer).
I’ve been using auto-leveling for the bed. There haven’t been any issues with first-layer adhesion and the print head does appear to be pressing the filament against the bed.
Given all this, I’m pretty lost on what the issue could be. Any suggestions would be appreciated.