Hello. This is my new extruder. It is easy to print, 3 parts, and can be placed on 2020 profile or on the corner. Also you can put the tube through the fitting for printing with elastic plastics.
https://youtu.be/TdMO-0ZrXW4
You need:
3 M3x20 screws
4 M3x8(or M3x6) screws
3 M3 nuts
2 fitting Bowden
1 608zz bearing
1 pulley mk8