Not particularly tidy as they were thrown together in Tinkercad when I got sick of the pipe guides being wherever the pipe bender wasn't, it's my first attempt at a published STL - couldn't find anything like it when I looked so maybe it'll help someone. Friction fit onto the arms, the guides are also friction fit. You may need to tweak scale if you find your printer isn't accurate (or possibly is more accurate than mine).
Printed with a 0.6mm nozzle in PLA on an Ender 3 V2 with direct drive, PETG would probably be better but they're working fine for now.
No supports.
The author hasn't provided the model origin yet.