A free simulation program With some of the items I am designing I would love to put them through a simulation. Like crushing, for example. I want to know how well my object can handle any situation I put it through so I can make changes before I print out the object, only to find out there was a weak spot.
I have been trying to learn ParaView but it is a little complicated off the bat, I would like something easy to use.
If anybody knows of a program that would be fantastic!
Fusion 360 will do finite element analysis (simulation), although I haven't used it. Whether it will perform the type of analysis that you are looking for, I do not know. Check Autodesk's tutorials.

One problem that you will encounter is that items printed using FDM technology are highly anisotropic. In other words, they have a grain, and are stronger/weaker in some directions than in others. I do not think that Fusion 360 can take account of that in its analysis.

Autodesk: Fusion 360