Horizontal Artifacts?
I have a newly setup V-core 500mm and everything is working, although I have these horizontal artifacts that are stumping me. Ive tuned linear advance and input shaping, as well as esteps. Yet there are these strange gaps in some horizontal layers. Is it temperature related?
I am using the PrusaSlicer profile. I slowed outer walls to 50mm/s and it still happens. I printed them at 205C, 100% fans (dual blower), and 0.3mm layer height. Any help is appreciated!
16 Replies
extended-yellow•2y ago
hmm that's a bit tricky, what hotend do you have and nozzle?
I get those when I print too low a temp. Bump it up a bit - 210 or 215C
I have a Pheatus Rapido hotend (not uhf) with the PT1000 thermistor.
Ok ill try a print at 215
extended-yellow•2y ago
yeah do that
Ok i checked and the cube print was actually printed at 215 not 205, whoops.
Should I bump it up to 220-225 ish?
Im using polymaker PLA too btw if that helps
oh nozzle is the hardended steel 0.4mm standard nozzle. So NOT the hf version
extended-yellow•2y ago
hmm, still, should be able to do that flowrate
you can attempt to slow it to a crawl and speed it up and see if there's any difference, as if it's a problem with extruding the requested amount of plastic
I mostly use polymaker pla. I print 215 on my non rapido hotend, but I also only print at 12mm/s^3 max. I would try 225 but if you are still getting gaps I would investigate if the filament is wet or if there is an issue with your hotend/extruder
ok sounds good, I will try both of those things
Here was the one done at fast speed and 220C. Now trying it with outside perimeter speed set to 50mm/s
I am having similar issues, but only with PLA.
Here is what I have done that helps...But still not resolved.
Try moving your nozzle to center of build platform.
Heat nozzle up to 220.
In RatOS, go down to manual extrusion, set the extrusion speed to 7mms(or whatever your max extrude speed is).
Set it to extrude 150 or 200mm of material, something to give you enough time to adjust stuff as it extrudes.
Now watch and listen. If you hear it skipping, or see the filament coming out not uniform size, try adjusting the temp up until it comes out smooth.
Also try adjusting the tension spring for your extruder feeder. Try backing it all the way off till it stops extruding, then slowly tightening it until it begins feeding smoothly. Then give it just a bit more tension than that.
For me, at 7mms feed rate, I have to be at around 248 or so...which seems really high to me for PLA. But it does greatly reduce the cracks I have.
I am still working out whats the issue.
I am starting to think it's an issue with my filament moving freely enough through my PTFE tube.
Interesting, I can give that a go. Let me try that as well
you might want to dissemble the hotend if it is having that much trouble going through. There is probably a lip or something on the heat break, or over tightened screws that have deformed it
So I switched to 0.2mm layer heights and 50mm/s external perimeter and the print looks much better. Its the shorter one in the comparison picture. So this means that the hotend isnt pushing enough plastic at the higher speed and layer height, correct?
I thought about that. But I measured where the filament is encountering the resistance, is a bit before it even gets to the extruder. I am thinking my PTFE has debris in it, or isnt very uniform....but whats weird is, that the ASA doesn't seem to have any such issues....
Yes. Try my suggestion above to see if you can get it hot enough to push through at higher feed rates.
So I had it working and it seemed to extrude just fine. I started this really big print but about 16 hours in these artifacts started coming back. So confused on what the issue is now. Temperature stayed constant at 215
