If you zip and attach a sample stl file here I can experiment in 20 and give you an idea of how much work would be required. There was an add-in for 2013 and I think more in 2014 but I have not experimented with them.
Inventor is not the best tool for trying to edit an stl file. The usual technique is to create a NURBS model and then export to stl.
Inventor is a NURBS surface/solid modeler. Stl files are coarsely - planar faceted surface models. So, for now, those are the couple things I'm stuck on. It's possible that Inventor isn't the right program for this sort of thing, and if you can recommend another tool, please feel free to do so. STL files I've downloaded thinking that perhaps there's an error in the base model, but I can't seem to locate that feature anywhere.
I've been trying to figure out how to apply a repair procedure to. However I get an error saying: "Unable to create hole. I'd like to manipulate those other files in various ways, such as changing their dimensions to 'stretch' them in any given axis, smoothing out features to reduce the level of detail, or in the case of one file, I'd like to bore a hole through it using the hole function.
STL files to test other design concepts and experiment with alternate possibilities. Right now, I'm working on a project of my own design which is being modeled directly in InventorPro (I have Autodesk Product Design Suite Ultimate 2013), but I'm also using a MakerBot for the purposes of importing and adapting. I'm kind of stuck on something at the moment, and need a couple pointers if you'd be so kind I'm not a 'pro', but dabbled years ago with an early version of Rhino (v.2, if memory serves) along with a desktop vertical mill (MaxNC) I had at the time. New member here, just getting my feet wet with Inventor.