It must be just the blue. I figured out green: https://sh.itjust.works/comment/22401881

This may have been it. Thanks! ref: https://sh.itjust.works/comment/22401881

Holy crap. So I tried a pack of the Green PETG (still Kingroon) and the first print didn’t go well. It didn’t like .3mm on a .4mm nozzle.

This happened:

A bit of a clog and other weirdness.

I took the default Cura PETG settings for .4mm nozzle, swapped to .2mm (fast) default settings then set fan to 50% and temperature to 230C… I got a beautiful benchy:

It’s beautiful.

I guess it seems like maybe something is just wrong with that roll of blue…

Makes me wonder if a Bambu or some other more set/forget kind of printer would have been able to print it somehow. Maybe I’ll try again one day.

Thanks everyone so much for all.

Interestingly, I tried the Kingroon green PETG and it looked ok at first then seemed to clog-ish.

https://imgur.com/a/tXUg2fA

It pretty much self clogged a few layers in. So about the same?

What should I see differently with retraction off? Like it failed but what should I look for then try next?

For good measure I tried going direct from the dryer to the hot end (and just left a piece in the runout sensor to have it not trip). More/less the same problems: https://imgur.com/a/65jzAQv … I stopped it early since it was failing terribly. Otherwise was using default cura generic PETG settings on .3mm per layer with .4mm nozzle.

What’s the recommendation to fix under extrusion? I tried changing the flow in cura to 102 then later to 118… no obvious differences.

I instead tried printing directly from the spool holder immediately after taking it out of the dryer. Same thing happened. I doubt it could have moisture-d up that fast for it to make a difference

Should I try a different one? I think all I have are Kingroon PETGs. I got them from a bundle of 10: https://www.aliexpress.us/item/3256806452989007.html … I have different colors though.

I actually like the ability for a local AI to help with this in theory. I don’t think it’s an excuse for unintuitive UIs though.