Prusa Mini REVO - extruder direct drive upgrade to Bondtech LGX Lite/TBG-lite Extruder  

Prusa Mini REVO - extruder direct drive upgrade to Bondtech LGX Lite/TBG-lite Extruder

Hi!

After I upgraded my Prusa Mini to REVO hotend and because I print mostly PLA I am experiencing problems with under/over-extrusion as mentioned here.

In order to fix them in PrusaSlicer I had to lower the "Retraction length" to 1.8 and set the "Min Print Speed" to 20 mm/s. This makes impossible to slowly print overhangs with “Dynamic overhang speed” set to 5,7,7,10 without under/over-extrusion.

So now I am considering the option to upgrade my Prusa Mini Revo to direct drive extrusion system either Bondtech LGX Lite or Trianglelab TBG-lite Extruder.

The TBG has two options for motors: Moon (more cool and silent one according to user posts) and LDO.

So the options are:

1. Bondtech LGX Lite with LDO-36STH20-1004AHG motor
2. TBG-lite Extruder with LDO-36STH20-1004AHG motor
3. TBG-lite Extruder with MOON CSE14HRA1L410A-01 motor

Q1: If the money are no problem which option is the recommended one? 

Original Prusa Mini Stepper motor E-axis Extruder current is set to 400mA (M906 T0 E400). The pancake motors options for Trianglelab TBG-lite Extruder are:

• MOON's 1.8° Motor Nema14 36mm Pancake Dual Drive Extruder Stepping Motor CSE14HRA1L410A-01
  (current must be set to 280mA (M906 T0 E280) according to this instruction)
• LDO NEMA14 36mm pancake motor LDO-36STH20-1004AHG
  (current must be set to 700mA (M906 T0 E700) rated to 1A according to the spec of the motor) and according to this post.
  Steps set to 880steps/mm.
  Retractation set to 1mm @40mm/s.
  Reintroduction to 1.1mm.

Q2: Except current, steps set and retraction what else should be changed and is it possible after the upgrade to continue using original Prusa Mini firmware?