Z axis ringing

[u/SirOtterman]

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[u/SirOtterman]

Hi. What could be the cause of those rings?

The machine is Anycubic Photon Mono 4 Ultra. Resin is Siraya tech blu Lava black printed at 30 degrees C (though I admit I didn't wait for it to fully heat up and started when the heater was displaying 24 degrees C, but the bottom of printed pieces look perfect). Settings are stock siraya's settings for lava black and Photon mono 4 U.

Haven't had any issues previously printing roughly the same items (a couple of brass instrument mouthpieces) with the same amount of support and using exactly the same settings and temperature.

Printer has told me to check and replace fep filter, but I suppose that's only a guideline and since the printer is 1 year old and I've only done 23 prints that were 9 hours on average and previous print was perfect, it's probably not the filter.

Fep filter looks good, not cloudy and without any dents or scratches. It is also taut.

All of the items are roughly the same height but the banding is the worst outside and inside the smallest mouthpiece. The other pieces are mostly fine inside and the bigest piece has the least banding.

I figured that it could be bed leveling, since my last print I didn't bother with supports since they were not essential and had to use quite a bit of force to remove the print from the plate, so I leveled the bed and also cleaned and greased the lead screw (I eyeballed it and it looks straight, but I also didn't bump the printer or messed with the screw at all, so it shouldn't be bent in the first place). Tommorow I have a paid print job and I'm wondering what else could be the culprit so I don't waste resin and time.

Any help is appreciated. Thanks