Hellou, looks like I have problem. Last time I always got this result and I tried fix it but without good output. Something is wrong but what. Cooling, speed, temp, … ? Wrong side is always where nozzle turn back to +x direction and go to next layer +z. Someone with any idea?
Additional infos:
Layer 0.3, cooling: 100%, Speed: 60, printer ANET A8.
Looks like improper cooling. You may be printing a bit too hot as well. What brand, material, and print temp are you using?
Also I can’t really tell from the single pic but you may have slight over extrusion.
you need to tune your coasting and retraction settings.
If you rotate the stl does it do the same.
Rotation was first option, and result was same.
Extruder temp is 200 first layer others 190. Filament is 3D World PLA 1.75 mm. Speed Periemters 50 mm/s Small perimeters: 15 mm/s Solid infill: 20 mm/s. Printed via Repetier( mode with Slic3r).
@Cristian_Nicola thx. But which parameters.
@Ondrej_Kollar1 you did not say which software you are using but most of them have 2 parameters called retraction and coasting. the coasting means the extruder will travel without pushing anymore plastic towards the end of the move and retraction means the extruder will pull a bit when moving so plastic does not ooze out of it.
@Cristian_Nicola Retraction is (Slic3r on Repetier) set as: Length 4 mm, Lift Z: 0.5. speed 40 mm/s, minimum travel after rectraction: 2 mm + whipe while retraction as true, Nozzle diameter 0.4.
Id say over extrusion.
Added next photo
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Can you add a pic of the top surfaces? It’ll help identify over extrusion
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@Ondrej_Kollar1 your layers look awfully flattened out. i’d say you’re printing too hot and he filament is oozing out of control.
issues are significantly worse where the nozzle stops momentarily. you mentioned that your retraction settings include Z-hop of 0.5mm. this is usually a good thing, but when you’re already printing too hot if the retraction isn’t enough (not long enough and/or not fast enough) the pause in horizontal motion incurred by the z-hop can make things worse rather than better.
short test: turn off z-hop and see if it improves. that should reduce the symptom but not cure the problem. if it improves then turn z-hop back on, increase retraction amount and speed a bit (maybe by +50% on each parameter or so) and try printing a few degrees cooler.
i use Maker PLA from @MakerGeeks and usually print at ~230C, but some PLAs ooze like crazy at much lower temps. I’m not familiar with 3D World PLA but suggest it might require rather low temps. Try 180-185 and see if you can extrude without grinding at those lower temps.
@Jared_Eldredge I looked up 3D World and it says 190-210 so hes right in the middle. I’d say to try lowering to 190, but I have a feeling the Chinese printer is simply not reading the correct temperature.
It does look like there may be some over extrusion but it’s hard to tell. The tops of the walls look like they may be scarred from the nozzle which indicates over extrusion but your large flat top surface is experiencing mild pillowing which could be under extrusion, too few top layers, or too much heat. I’d say too much heat because the drooping overhangs seem to support that theory.
Check to make sure the value your thermistor is displaying is accurate, it looks like it’s well below the actual temp. If that’s not the case try decreasing print temp. You may also want to recalibrate your E steps.
Thanks for help guys, I have now a lot of points to check.
You’re overextruding, severely. Make sure E-Steps per MM is calibrated properly. Make sure filament diameter is correct. Make sure nozzle diameter is correct.
@ThantiK What are you seeing to indicate overextrusion that I’m missing?
@Adam_Steinmark Piling on the infill, zits and blobs where retraction is supposed to be happening, smearing across infill lines, irregularities on the outside border of walls…I don’t know how you’re missing it. There are clearly areas where the nozzle is dragging itself through molten filament…the stringing is a result of increased nozzle backpressure and oozing once the nozzle hits free-air and isn’t having to push against already extruded plastic…there are lots of indications here.
@ThantiK Yeah I saw most of that but I figured most of it was the temp since the walls don’t look overstuffed.
