I have seen that newcomers to MOI have problems with complex geometry. It is natural that one will have trouble while learning. When I started, my fear was that I would encounter some configuration that I could not resolve with the tools that Michael has given us. After thousands of hours of working with MOI I know that I can always get what I want -- but it may take more work than I would like to spend. I accept the time involved because the results are spectacular, and I don't know any other way to get it done. The model that I'm including here is an example of what I'm doing. A lot of the models that I see are just intended to look like something; they don't have to be made and function. This is a cylinder which will be cast, machined, and part of an engine that will be used in a motorcycle. Dimensional accuracy is critical. Everything was done in MOI -- I didn't have to export anything to another program to solve some problem that I couldn't solve in MOI -- as other users have sometimes suggested is the only way out. People who have trouble with 'fillets' may be shocked at what they see here. I actually think that the ability to blend one surface into another is a strong point of MOI. You can judge for yourself. The file is too large to post directly (even though I deleted much!) but try this link:

Cyl Less Manifolds_3dm.zip