I have lots of memories walking through the GM Electro-Motive Diesel factory floor in LaGrange where these things and others of their species were lined up and moving about by the dozens.
Thanks to BlacklightShaman on for digitizing the pieces and optimizing them for printing.
~Model Kuka Quantech KR120 R2500 - I went with a denim blue shade over the classic Kuka orange. This is 145% model scale.~
Solutech & Tiertime PLA & ABS
Denim Blue & White
Be very careful orienting the pieces. Use plenty of walls and a 3D Infill pattern (eg. Cubic subdivision, NOT Lines or Triangles). There are pieces you will likely have multiple attempts at printing. I suggest acetone/ABS putty as glue.