Hi Andy,

I don't know if -what I want to suggest- will be helpful for you or not!

>when I try to import it into MoI3D V4 it takes a very long time on my fast PC.

I also once tried to import an Stl in MOI so, I opened Blender and saved the Stl file as an Obj but it took a lot of time to be imported in MOI and it never imported it!

Then I realized there were overlapping points (vertices). so, in Blender I did
something used to be called (removing doubles!) and then saved the file as an Obj. This time I was able to import it in MOI without any issue!

I don't know if you checked your model for double vertices or not but I recommend you to check that before importing it in MOI.



I was able to import your attached model in MOI as an Obj but only after I removed over 4000 excessive vertices using Blender.
Hope this method will help you.

-Psygorn