Looking for a quick bit of help. Netfabb basic limitations

I've been beating my head on the wall trying to work around limitations of the free version of Netfabb. I'm trying to combine 8 parts into a single part, but that is frustratingly only available in the pro version. I already have a model of what I'm looking for, but irregularity in the faces are making it print terribly. If someone was able to open my .fabproject file, and combine those parts for me, it would save me a huge amount of time.

Also if anyone knew a workaround that I can do with the free version, it'd be much appreciated for future projects.

https://www.dropbox.com/s/vanzfb3yjd...bbproject?dl=0

Thanks in advance.

Maybe try OpenSCAD

Your mileage may vary, but I find that usually you get what you paid for....

You can try loading it on a FREECAD and see if you can patch it up.