This was on my list to program, and I finally had a good reason to see it through.

Anyways...it makes a transition from a square to a circle, or vice versa...

I made a funnel with it.

For thin-walled renderings, choosing a whole multiple of your nozzle diameter, will give the best end-result.

It's possible to be printed in vase-mode too.

It's a simple model, and not perfect.
I found that some settings render a STL that needs reparation, and others don't.
Just click repair and your good to go!

Prusa

i3 MK3

No

No

0.4mm Nozzle, 0.2mm Layers

only walls