Having run off four quick prints with identical settings, I measured the thickness of the skirt threads around each object:
They’re all slightly thicker than the nominal 0.25 mm layer thickness, but centered within ±0.02 mm of the average 0.27 mm. Tweaking the
G92 offset in the startup G-Code by 0.02 would fix that.
The 0.29 mm skirt surrounded the first object, which had a truly cold start: 14 °C ambient in the Basement Laboratory. After that, they’re pretty much identical.
Some informal measurements over a few days suggests the actual repeatability might be ±0.05 mm, which is Good Enough for layers around 0.20 to 0.25 mm.
The larger skirt suggests that the platform has a slight tilt, but the caliper resolution is only 0.01 mm.
When I realigned everything after installing the V4 hot end, the last set of thinwall boxes looked like this:
Their heights were:
Not enough to worry about, in any event, sez I…