The good news: the Y-axis plate checks out fine. All 8 holes line up with the 80/20 50mm by 100mm extrusion, the holes for the motor mounts look aligned, the holes for the eccentric nuts fit exactly, and when the wheels are attached they are correctly spaced for the marker slide.
When the 11 year old was screwing in the screws for the 80/20 extrusion we both noticed that some of the screws were loose.
That's the ok news. The screws were loose because I tapped the axis with an M5 tap, and I should have used an M6 tap. Fortunately, a problem that is easily fixed.
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