Hi Chris, well there are going to be several steps involved.

Even apart from having some holes in the bottom part (84 naked edges) you've also got your model set up as various separate solid pieces instead of just one single solid which is what those RP things want to have.

For example you've got 1 object here which is a solid:



But then right next to it you have this completely separate object which is another solid:



You generally want to combine things like that together into just one single solid, probably by doing a boolean union on them.


The openings look like you have some surfaces in place ready to be joined in to seal them up. Like for example this part has some openings in it:



However, you've already created some surfaces that fit in at least some of the openings, these are some separate surfaces that are hanging out just right in that spot:




You need to use the Edit > Join command to glue those separate objects like that together so that they will be connected at a joined edge, rather than just having completely individual separate surfaces that are just positioned next to one another.

The actual joined connection is what you need there.


I haven't had a chance to look at all the different holes in that lower part, but if they're all like that then you just need to join those pieces together in order to make closed solids from them, then probably do boolean union between those solids to make the whole thing just 1 big solid instead of a bunch of different separate objects.


Does that make sense for what needs to be done to fix it up?

- Michael