You can build your own .3dm files but it takes time and you may not get the best results. If you’re like us, then you’ve probably got a few spots you check for models, and you’ve also probably bought some sets over the years. But you always end up needing something you don’t have, and having to look around.
I did some snooping through my lists of sites to find ones that offered a good mix of .3dm models. Not all the sites are free or have large selections, but they are all dependable. Take the time to browse through a few of them when working on a project and you should be able to find what you need.
TF3DM – http://tf3dm.com/3d-models/all/1/3dm
This site has a good selection of models, but they range in quality from high-end to beginner. You can find anything from full buildings to Black Hawk helicopters to a T-Rex. Prices vary a lot, and you need to be careful to check which license is available for each model.
CGTrader – http://www.cgtrader.com/free-3d-models
A library of free 3dm models, heavy on automotive but you can find some animal, environment and product models if you look around for a bit.
GrabCad – https://grabcad.com/library/software/rhino?per_page=20&query=3dm
Not a very large selection, but there are some nice ones here & the site has good search functionality.
This is a free collection — available for both personal and commercial use (but not reselling) — from Aleksandar Dimitrov. Mostly furniture models, but some exteriors like fields thrown in.
FlexiCad – https://www.flexicad.com/download.php?lang=de&misc=1300
Honestly, it’s only 4 models here but its worth going to pick up the Audi TT model.
Aversis – http://www.aversis.be/3dmodels/
Not many here, but they are all decent quality. Click the links labeled “Rhino” to get the .3dm files.
Turbosquid – http://www.turbosquid.com/
You’ve probably come across this site before. Big selection of models. You can search subject and then filter to get models compatible with Rhino. Pretty much everything here is high-quality, but you’re going to pay for it: prices range from US $5 – $500. Fortunately, you can filter by price. If you need a model for work, then this is a good place to look, but not sure its the right place for a student.
Craftsmansspace – http://www.craftsmanspace.com/free-3d-models
If you’re looking for free geometries and pattern 3dm files, then I’d check here. Nothing to fancy is available, but you can use these models for things like fencing, icons, wall art without too many problems.
Yobi3D – https://www.yobi3d.com/
It finds 3D models on the Internet with simple keyword search. The models can be previewed in 3D right on your browser.
This list is a work in progress. If you’d like to have your model site, set or file added, then leave a comment.