I found lots of issues with thing:19026 when I tried to slice it. The positioning of the parts in the model appeared to be eyeballed and it required a... lot of unnecessary supports. This one should print without support, and of course it's completely parametric.
with the experimental firmware and upgrades that are on my bot right now, I haven't managed to finish a print of this yet, and I probably won't get another chance to try for a few days, so I thought I'd post it now and see if anyone else wants to try.