Yet Another Nerd Solution - BMG Extruder Dual Drive Extruder Modification

Disclaimer:
Use this thing at your own risk, it works for me, you are modifying the 3D printer. The author or the hosting site cannot be held responsible if anything goes wrong and messes up your print, machine or if your house catches fire. Use common sense and always wear proper protective gear when using power tools, grinders, drills, etc.

BMG Extruder Dual Drive Extruder Modification:
A. In some of the dual-drive units, there is some deviation between the gears, in my case, I added a 6.5x3.5x0.5mm printed washer (included in the STL file), a suitable metal washer is fine too.

B. The original release lever was too strong and short, it was very hard to load and unload filament (you needed 2 hands to release the lever), so I add this printed washer collar combination, plus replacement of a new spring, now it's very smooth and easy for the maneuver.

C. Upgrade from the OEM to Dual-drive extruder, you need to adjust the E-Step from the default 93 steps/mm to around 420 steps per mm, in my case with the Eryone ER-20, I made it at 430 steps per mm.

For more info and photos please click the following link:

https://www.thingiverse.com/thing:4800707

Please advise the author of any errors and omissions.