I have made several models that [should be] completely flat on the top, but the top edges are very slightly rounded upwards. The rest of the top is very smooth (I have Enable Ironing set to True). One thing I have considered trying is setting Ironing Inset to 0 in hopes that it will flatten that area out, but that doesn’t seem like it should be necessary. Any ideas?
Is it really only on top? It sounds a bit like warping, but “classically” warping happens at the lowest layers first.
Do you have a photo?
Yes, it is only on top. While watching another one of my prints, I noticed that it seemed to be happening at the edges of ironing areas, I have more detail at:
Comments for Top Edges Rounded Upwards by njsokalski - Thingiverse
The model contains several engraved circles (not holes that go all the way through), and the top edges of these engravings have the same kind of upward roundings as the outside edge of the model & edges of ironed areas.
Adjust your flow rate down a bit during ironing. It’s pushing a little extra plastic along the edges. Ironing is very dependent on having your printer dialed in perfectly. To quote the ironing section from Prusa;
Calibration
Ironing is very sensitive to accurate extruder calibration.
Too little and shiny groves will be visible at the top layer, which will not be ironed.
Too much and the excess plastic will be dragged by the nozzle to the edges of the top surface.
So calibrating is a matter of trial and error.
One may experiment with the ironing flow, speed, and spacing to achieve the best results.
Third point seems to be your bugger.
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