This is a replacement coupler for the KitchenAid blender model KSB4028BM.

I printed it as solid walls using PC, and it is working great. I don't suspect this part is put under a lot of stress. I made it as close to the original as I could. It was a bit of a tight fit, but I'd rather that over lose.

Print it upside down with supports. Push something like an allen key through the bottom screw hole and the support pops right out.

I don't have a paid subscription to Shapr3D, so the resolution is lower than I'd like. However, this part isn't really seen and it still fits even though there are facets.

I hope it works for you!