Suggestion: since MakerBot is a specific brand, and "tinkerer" debases the effort that people put in, I suggest the phrase should be "users/developers of RepRap / Rep Strap" machines.
As sburlappp points out RepRap is another brand, but I'm not sure "fabber" is the best alternative.
Perhaps "users/developers of personal 3D printers", with 'personal' intended to convey those printers on the lower end of the price range?
Alternatively, "3D Printing hobbyists" might be more appropriate.
RepRap is most definitely not a brand - it's more of a series of machine designs. More like saying "car" or "truck" than saying "Ford" or "Mack". Certain companies may (do!) sell RepRap machines but the term itself does not refer to a brand.
edit: and, to take a stab at being useful if not actually answering, I think the name should:
- avoid company names
- avoid specific styles (i.e.: RepRap, no offense!)
- avoid "hobby" "experimental" etc since several companies are doing mainstream products
"Home 3D printing" (or "printers") isn't bad, IMO. Something like "non-industrial 3D printers" is probably better but a bit of a mouthful..