Prusa Mini Direct Drive LGX Lite REVO Micro

Prusa Mini conversion to Direct Drive Bontech LGX Lite v2 with a Revo Micro hotend.
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updated February 26, 2024

Description

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Update 2024-02-26 - i am really happy with this upgrade. 
The extrusion is much more consistent and especially on corners, where it is sharp and identically performing as my MK3S+. I have only printed PETG with 0.4mm nozzle. I have runned a linear advance test where i choose 0.08 (default is 0.2). 0.08 is also the same value as my MK3S+ (default). Note that i am not for printing fast. So the added weight of the tool head is not a problem for me. I consider strength, accuracy and quality higher than speed.

For mounting the bracket you need:

1 x M3x8 (Button head screw for a low profile)
3x M3x10 (Button head or normal)
There is four M3 holes/nuts to mount the LGX Lite. Two is 5 mm deep and two is 10 mm deep.
https://www.bondtech.se/downloads/TDS/Bondtech_EXT01LGX41003.pdf
One of the holes is not used. So three screws into the extruder and one screw into the revo micro mount from the side. 

For the PTFE Tube i forgot to note the length.. Sorry. What i did first to measure was to insert a tube into the revo micros top. Then cut it flush with the top surface of the revo. Then i screwed a small screw (2,2 mm) into the tube by roughly three turns to get it out. The little piece of tube is the depth into the revo (Maybe available by E3D). Then i measured my way up to the extruder. I think i got 41 mm. If someone decides to make this, please comment this length, thanks.  

Gcode:
For the start Gcode i entered this: 

M603 L80 U80 ;set the load/unload filament length
M906 T0 E700 ;set current for the extruder motor

Tip for Revo. Add a retraction by 20 mm when finished with the print. Then you can swap the nozzle before the next print. This can again be extra extruded in the intro line. 

The E-steps can be changes by holding the knob down in 2-3 seconds while selecting the HW Settings in the menu. E-steps: 562 is provided by Bondtech. 
https://help.prusa3d.com/article/experimental-menu-mini-mini_264396

The motor is a LDO Nema 14 (included in the kit i bought - extruder + motor).
The wiring is shown on this photo - Blue to Blue, Red to Black, Green to Green, Yellow to Red:

 (First connect blue to blue, and then connect the next and next wire. They are not matched by color. I reversed the direction in the same menu as the E-steps. If you know the correct way to wire it without making the reverse direction, please comment 👍😁 Maybe the way they are connecting the wires on the this mod is the correct way? https://www.printables.com/model/66519-prusa-mini-sherpa-extruder-direct-drive-conversion
File from that mod: https://drive.google.com/drive/folders/1LVL6v0iTNmk36HNwWPd6cIDwvMeIWmEx
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Tags



Model origin

The author remixed this model.

Differences of the remix compared to the original

I cut off a piece of the Revo Micro bracket so there was room for a third screw on the LGX. 

The other models was for reference. 

License