ABBEY - THAT LOOKS AWESOME! I'm going to design some up myself this afternoon!
John - The SLA is used these days to reference 3d printed resin, where the resin is UV cured in layers. SLA/Resin printers are cheap these days, as they mainly use a LCD screen with a UV lamp, and a single stepper motor that moves a plate up from the screen. (sorry, bad description).
I mostly use my Resin printer for printing small external components, such as knobs, bezels, things that people see, as it's resolution is 10x what my FDM (extruded plastic) printer can do.
For internal components - PCB holders etc, it's hard not to beat FDM printing. Cheap, pretty quick (faster than postage!) and providing the environment isn't harsh (e.g. hot, pressure etc) it's perfectly strong enough.