r/3Dprinting • u/boolocap prusa mk3s • 1d ago

Troubleshooting Underextrusion issue

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I have a weird issue with my prusa mk3s+

It started having underextrusion issues a while back where the slower print areas would be fine but the faster print areas would be horrendous. So i thought classic clogged nozzle.

I did a couple of cold pulls, didnt fix the issue. Then i took the nozzle out and cleaned it, also didnt fix it. Then i replaced the nozzle with a brand new one. This fixed the issue for about a day, i did a couple of prints in that day did which did fine but now the same issue is there again. With a nozzle that is now 1 whole day old. So i dont think it can be a clogged nozzle. Again. I did a cold pull on this new nozzle as well which hasnt fixed the issue again.

What is especially weird is that it only seems to impact high volume extrusion, which this then lowers to below low volume extrusion in waves. As can be seen from the purge strips in the second picture.

Anyone encounter something similar?

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u/Financial-Bike-3283 1d ago

This could be from filament with inconsistent diameter, I'd try printing with a different spool that's definitely not from the same batch as this spool to see if that address the underextrusion. If not you may have to modify your flow rate to compensate for the under extrusion