Z wobble or odd extrusion artifacts.
Hello everybody, recently my Prusa MK2 developed an odd issue where the sidewalls bulge on rounded corners. I'm not sure what could have started this, and I've checked my belt tensions and calibrated my extrude as well. I almost want to rule out z-wobble because it's not at any regular interval, it seems to be purely random. I was using PLA and sliced it on Simplify 3d V 3.1.1 with .2mm layers, 4 perimeters, 10% reclinear infill at 30mm/. The extruder is set at 205c and the bed at 60c. I've also used PID autotune on the extruder and placed those values inside, so there's no temperature ringing either. Does anybody have any idea what could be causing these issues? It doesn't seem to lessen or worsen no mater the layer height or the speed.
Re: Z wobble or odd extrusion artifacts.
Have calibrated extruder motor? What about different filament - color and brand - the same problem?
Re: Z wobble or odd extrusion artifacts.
New roll of filament maybe? Could it be there is some inconsistence In the filament cross section?
When I was having filament feed issues due to stiff axle, there would occasionally be a bad level or two, and then would be good again.
I changed to ball bearing hubs for spool feeder and issue seems to be gone now (at least not present in any prints since the change).
You are getting several levels doing the bulge, and it isn't abrupt, but smoothly goes from straight to bulge and then back. Each bulge is also similar in height. To me this suggests something with a intermittent effect that gradually goes out and then back over a cycle of many layers.
Maybe the filament gets gradually bigger for a meter or so, and then gradually back to specification. Stays good for a couple meters and then goes out again.
Just a guess. Maybe try winding off say ten meters to a spare spool and measure the cross section in two perpendicular directions every half meter or so with a micrometer. Should stay pretty darn close to 1.75mm all the way (or at least stay the same measurement all the way).