Great original design, big thanks to Somnium for also posting a Step file :)
To make it print easier and cleaner I removed most of the filet and replaced them with chamfers, especially the big inside one, also added Prusa style bridging geometry so the top hole prints well.
Hope you like the changes.
use a modifier box with 0 infill for the thin walls to print nicer.
No support needed.
The author remixed this model.