Drawer Bottoms & Backs
Did you measure and update the thickness of the material used for your drawers before generating the workpieces?
I didn’t when I cut this first batch of cabinets, but the difference between measured and actual thickness is something like .01". (actual is around .49")More to the point, the place I’m having issues probably should not be affected by material thickness.
Can you share images of the gaps at the back of your drawers?
It was hard to capture in a photo, but here’s a couple examples.
Inside and outside of a drawer for a 24" cabinet.
Back and front of another drawer for an 18" cabinet. This one is particularly bad. Notice even the front isn’t a perfect fit—the back is large enough to have thin things slip through.
In these you can also see how bad the half-blind dado looks. I don’t think it’s an issue of the measurement (since it was off by less than .01"). It just leaves an ugly void at the top of the drawers.