We're looking into an elegant way of solving this. It's nice to have a large list of printers, but not everyone should be bothered by it because we have hundreds of obscure materials / machines.
The best idea we've come up with is to make a system that works a bit like the plugin browser, but then for materials / machines. That also adds the benefit that we can expand on that system, so people can discuss settings (It's then a bit more like a marketplace, but free)