Belted Bowden Extruder with Filament Runout v2

Version 2 of my Belted Bowden Extruder with Filament Runout, which includes the following enhancements:

1) Fixed stepper motor
2) Spring loaded belt idler (Needs two 3mm SHCS/nuts to fasten to top_frame.
3) Carries over additional enhancements from v1

Assembly under load for a couple months has not shown any frame deformation or deflection.

Calibrate E-Steps using Bowden method: https://www.matterhackers.com/articles/how-to-calibrate-your-extruder?gclid=CjwKCAiA0uLgBRABEiwAecFnk3e6VjF