A 3D-Printer with an infinite Z-axis.
https://www.kickstarter.com/projects/3dprintmill/creality-infinite-z-axis-build-volume-printer-3dprintmill/description
The latest update show the printing on an I-beam that is 6 metres long!
Creality are one of the few 3d-printer manufacturers that have committed to making all of their 3d-printers are released as OSHW.
Iโve got one on order.
Yes, i do know about KSโs anti-union stance, but right now theyโre the only game in town if you want a successful crowd-funding campaign for hardware.