stronger central mast for tractor sprinkler

prusaprinters

I love the design of Jacks Traktor Sprinkler, however I had a few of issues with the central mast or pinion of the mechanism. The printed pinions always broke right at the upper thread, just a tiny bit of force on the spray-arm and it snapped right of. To fix the issue, I've added about 0.4 mm in thickness to the upper thread, reducing the internal diameter to 6mm instead of 6.8.This doesn't make a big difference in the water throughput but increases the stability of the whole thing by a lot.