I'd suggest using the rules for Resource Points, and put some limitations on the Equipment pool to reflect how the technology works.
The printer needs a blueprint for the item to be printed. Creating one from scratch requires a skill roll and considerable time.
Raw materials are needed: for example, if the design calls for tungsten carbide and you don't have any, you're out of luck.
There may be limits on tolerances and material strengths: the gun stock is easier to make than the barrel, for example.