In 2013, I built my own opensource 3D Printer. I modified the Prusa i3 design. Controlled by: Arduino Mega + RAMPS 1.5 with Sprinter firmware.
The frame is made from 1/4" laser cut steel plates and 3/4" lathe turned rods. The build surface is heated and 10" x 10" x 10". Recently, I made several
improvements and upgrades, which include a large screen graphical LCD with SD card reader and a genuine E3D titan extruder.
Future upgrades include a BL Touch auto bed level and 1.75mm E3D V6 Nozzle.
Over Christmas break 2017, I machined some small parts for my lab. These parts are cannula, used to mount soft tissues on our inflation-extension test device. The material is PEEK plastic, it can be auto-claved and machines nicely. Check out my YouTube link above, there is a quick video of the PEEK being machined. The lathe I used is a 1934 Southbend 9" Workbench 405. This lathe is a restoration project I completed in 2010.