That's really helpful! I realized that both of the places in your screenshots are places I used the same tool to fix the geometry. What happened is that I used the delete and patch tool in Solidworks to merge all of the corners in those locations. That's apparently what the real geometry looked like before I did that. Solidworks showed it the way I wanted it to look and so did those other programs but apparently that geometry was still there and only MOI, Rhino, and ViaCAD could see it. I got rid of that operation and now it exports without issue! I still need to clean up those corners but it'll be easier to do that in Houdini after its been converted to OBJ. Thank you!