Ironing on circular object - gap

I encounter this peculiar issue when trying to have ironing on round flat objects. It leaves a gap in the middle as shown. And when I print it, it is as per the preview. No issues for rectilinear though.

Anyone experience the same or have answers to this? Thx.

Hi @WillSG,

Welcome to the forum.

It is expected, and in my opinion (maybe wrong), it relates to how the ironing algorithm works, by offsetting the outer contour inwards with an equal step, for which you need to account for the surface outer and inner diameter, discount the walls width and then calculate the top surface wall line witdht accounting the added flow rate, and account for the ironing line spacing and inset.

If a concentric pattern is not up to discussion, try a lower line gap, yet it may require further calibration.
Math is possible, but I could only achieve a near-ideal preview with customer inner and outer diameters, and ironing specs far from recommended.
You are likely to get better surface quality with a rectilinear pattern.

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Share the 3MF.

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test c.3mf (38.1 KB)
here u go