This is a recreation of the simple ironing test square by VladSalad at Thingverse. It's just a simple 50mm X 50mm X 1.6mm flat cube, I recreated it in FreeCAD and exported the STL so it's not the same file, but it is the same part.
It really helped me nail down ironing settings.
You can check VladSalad's instructions at Thingverse, but after working with this for a bit, here are my tips:
The photo is of 0.2mm ironing line width, 13% flow, monotonic pattern and 100mm/s ironing speed. Next I tried 0.1mm width and 14% flow, with part flow 100% initial layer and 88% subsequent layers. That part's even smoother in the center but rougher at the edges where excess material got deposited so this photo is just about ideal for my setup. Maybe 0.1mm ironing line width and reduced speed would be better, but flow seems just about right. The second photo shows this is perfect for me (0.1/13%), very very smooth center, just a little combing at the edges and a little excess material pushed off the side. Easily cleaned up!
Print settings:
0.28mm layer height
0.4mm nozzle
No raft, brim or supports
Infill doesn't matter, this part is solid
The user re-uploaded this model. The user is not the original author of the model.