Fusion by Autodesk is one of the leaders and if you paly it right it's
FREE
If you get each of the users to apply for their own personal account you can install the software on a machine(s) and users then logon with their own account. There are some limitations but I have not yet run into one with 3d PRINTING CAD/CAM is a affected more.
Alternatively TinkerCAD is pretty straightforwrd and extremely useful for different tasks
You can have a look here for free software
Then there are the paid versions but I haven't seen a need for one yet.
If you want to chat about it get in touch.