3D printing can repair farm tools, including this electric drill:
https://hackaday.com/2018/01/29/3d-printed-battery-pack-keeps-old-drill-spinning
See how this 3D printed gearbox lifts an anvil with ease:
https://hackaday.com/2017/07/27/3d-printed-gearbox-lifts-an-anvil-with-ease