Metal printer

Okay… since a foundry is probably right out of the window. https://all3dp.com/iro3d-is-developing-a-desktop-metal-3d-printer-that-only-costs-5000/

some of the folks I collaborate with on delta robots built this:

http://www.appropedia.org/MOST_open-source_metal_3-D_printer_v2

Not as polished, but a hell of a show.