I've made a few improvements from the original design, and hopefully should be a bit beefier than the original which had very thin walls seemingly prone to cracking at the top.
Also included a place to snap the mesh filter into the print as well.

Finally i've change the rounded edge to be a hex edge for easier tightening with a wrench. This however does make installation a bit complicated. The plastic ring that holds the ball inside needs to be slotted around the edge carefully radially to put it in place but it can be done. If someone wants a easier to install version you would need to remove the hex part of the model.

This is designed to print with the ball side down on the build plate. Recommend printing with supports at 100% infill. I used polymaker polymax in grey to match the original color.