When printing cylindrical shapes I am seeing strange behavior around the entire circumference, see attached photos compared to slice and model. This happens regardless of layer height from 0.8mm to 2.0 mm in steps of 0.4mm. Material: PLA.
A 20mm calibration cube was accurate to within 0.5mm on all axis prior to this print.
Printing temperature 207, bed temp 65; fan on. Extrusion has been calibrated to within 1mm of the expected extrusion.
The photo attached was done at 2.0mm layer height at max 60 speed; wipe on retract enabled.
Looks like a retraction/seam issue. It will not present itself so obvious on a cube shape as on a cylinder if seam setting is set to other than random. Relevant settings are:
Quick and dirty solution would be to make sure seam setting is set to other than random. However, as previously stated this will not work on a cylinder shape.
Since it is consistently happening at the 8mm point where the internal base ends; I thought it might have something to do with the internal 5mm fillet; however I did a test print (same printer settings) but otherwise removed that 5mm fillet and the same problem exists.
How does other print looks like at the same height? Iām thinking it could be related to some type of resistance in z-axis. If so, it should be repeatable on other objects at the same heightā¦
This is the first functional object I have created; everything else has been the silly things like articulating lizards, e.g. the stuff made by Matt Myers; all of it has come out fine with zero issues. I am running a third test print now, I think it has to do with the PrusaSlicer settings āExtra perimeters if neededā and āEnsure vertical shell thicknessā so will find out soon.
Those could possibly make the issue worse but imo they are very unlikely to be the primary source of the issueā¦ Personally I would start by exluding hardware issues as primary source of the issue by printing something that is taller than the part you just printed (and with thick walls). If itās not a hardware issue I would question the flow/e-steps. That can be tested simply by reducing the flow and see if the problem dissappearsā¦
If you printed an appropriate geometry for the test, that result would very much indicate that there is a hardware issue. I recommend that you investigate that until you can either confirm it, exlude it or solve it. I would guess that itās some kind of resistence in Z-axis. Maybe you can try to realign it somehow? If the crossbar is movable when printer is off, then you should do that and try to feel if there is extra resistens at the height of the bulgeā¦
You could also place two small objects of exacttly the same dimensions under the crossbar right and left side. Then while printer is off, push the crossbar down onto the objects and posibly align your crossbar betterā¦
Turn off the machine and slide the x axis all the way up and down, see if anything catches.
Then take two equal objects, like to identical cans of food. Like canned bean or something, put them on the platform and slide down the x axis, this will tram it, make it parallel to the platform.
Sometimes, one side of the x axis can be lower/higher due to some failure or accumulated error, this will make sure it ruled out.
No. They can only make it worse if flow is already to high. Iām not so convinced that your laser measuring is good enough =) is the z axis not movable while printer is off? Better to feel for resistence by moving the crossbar than to use laserā¦
Another thing could be to loosen some screws and see if you can get the frame to be more straight/perpendicular and the tighten the screws again. It doesnāt take much misalignment to cause such artifacts that you have on your printsā¦ or reduce the flow and see if it helps, but if that was the problem, it wouldnt always happen at the same heightā¦
Just tried changing the infill from Gyroid to Concentric and the current problem goes away while introducing a different problem, so anecdotal evidence suggests to me its something to do with the barrier between the infill and the solid interior base.
Too much material can cause that. Depending on the geometry of the part, the extra material will find its way to the infill or make the outer wall bulge out. Did you try reducing the flow?
