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hobbymods
I can still see banding in the 0.1mm print, just much less defined. Little bit of "shadowing" around the porthole in the bow as well.

From the sideline they still look like some good prints for starters! Certainly up there with what you'd get off any of the commercially available machines.

The banding seems "cyclic", suggesting either something happening per turn of the z screw or as suggested above the bed temp fluctuating (will that have an effect that far up off the bed?). Could extruder temp fluctuations contribute to it?

I've had quite a bit to do with those MG9 rails, and they can be fickle.

You need to get grease inside them, not just wipe it on the rails or they will play up. On genuine Hiwin there's a little membrane you have to push through with a hot pin or something and then there's a special little tip for a mini grease gun...it's a pain in the arse.

Last time I spoke to them they recommended EG/HG rails due to the fact they were cheaper, had an extra race of bearings, a grease nipple and better performance over all especially regarding play. Just what they said.

What size bed is that?

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dc42
One possibility is that the heated bed temperature is fluctuating too much. Is it stable to within +/- 0.2C of the target?