It would be nice to be able to select materials that match those used in SLA printers. For example, materials that behave like the rigid but brittle clear/grey/white/black photopolymer resins for the Form 1 and Form 2 from Form Labs, as well as materials that behave like the durable/flexible Tough resin (which is great for creating things like reusable snap together fittings), or the Flexible resin that is analogous to rubber. There are numerous alternate vendors for these products with minor variations in the behavior of the cured polymer, but they are similar enough that generics for basically those three classes would cover most resins.