A mystery. I had a jam in the hotend after printing TPU and finally got that fixed and some errors from the filament sensor being confused. I decided to print the Creality spatula gcode file... that is sliced for a 0.4 nozzle... and I could see when it was getting done that it looked really good and then I remembered I was printing with the 0.6mm nozzle.
I guess that flow rate calibration is pretty good.
The box took 1h 56m 49s to print.
The Ultimate Box Generator OpenSCAD. Looks like I need to update my version too.
https://www.thingiverse.com/thing:2594893
The first poops from the chute!
I'm printing a box now.
Printed a poop chute, it took 1h 38m 20s. I didn't notice the design had a thin area but it mostly printed with gaps there. No supports and the top overhang printed ok with a little droop on the tip that was compensated by the slight curl as it printed.
This design, which I chose because it didn't need support.
Tom