I've been at it again.
I've been using the hell out of these drawer thingies, what with you fill with Gridfinity bins and store ~~pocketknives~~ various things in.
Well, I screwed myself over and it turns out I need a stack of drawers one cell narrower than stock. The original author posted sources in Onshape but I will be buggered if I'm signing up for Yet Another Account just for that.
So I reconstructed the entire thing -- my way -- in FreeCAD. Because obviously that's the less insane option. (I guess this also allowed me to excise the magnet ears from the drawers, which is a worthless increase in print time and small waste of material for me since I don't use magnets with my Gridfinity bins)
Anyway, here it is.
This is my dinky 2x2 test print. Which is very nearly but not quite completely useless. (For instance, it fits Nite-Ize cable ties very well, as you can see.) If it makes you feel any better, the generator absolutely will make you a 1x1, 1u tall drawer assembly if you ask it to which truly will be fully useless...
Did you consider using the FreeCAD Gridfinity Workbench (or, for that matter, writing a patch for it to support drawers)?
I never knew such a thing existed, but I'll look into it.
I don't touch the workbenches much. Up until now I've never found a use for them, and most of the ones I've tried on a lark tended to be buggy enough to be more trouble than they're worth.