Sure thing! Did you guys get the emails I sent to support@carbide3d?
Anyway: I wanted to do a waterline test on a 1"x1"x.625" block, so the first thing I did was to do a roughing-pass only job just to get most of the other stuff out of the way, so I roughing-passed a 1.125"x1.125"x.625" block.
Here’s the result of that:
So it is drifting pretty aggressively to the +X. Here’s a view of the side where you can see the scallops and steps:
The bottom of the block measures a tiny bit larger than 1.125" (I assume because the roughing-only pass leaves a little bit of material on? But the top of the block measures around 1.0625", so it’s off by about 1/16" by the bottom.
After this I did my actual waterline-only test, with a stepdown of .005" as you suggested earlier. This also had some taper, but not quite as much as the roughing only job. I rehomed the machine but did not remove/replace the stock or rezero the machine, and I verified with jogging the machine around that 0,0,-.625" was where it should be. This is what it looked like several waterline passes through:
You can see that the waterline block is not centered on the roughing-pass block (because the left wall of the roughing pass was shifted over ~1/16" by the drift of the previous job), so the ledge on the left is smaller than the ledge on the right.
And here’s pictures of the taper and the tapered wall after the waterline test is complete:
