Low Rider MMU - cho mọi máy in Klipper

Welcome to the Low Rider MMU.

###### Please post your Makes ######
Please like this, download and post the make if you built it
It helps us makers with feedback and gets us some Prusa meters as most people don't pay it forward

Feel free to help my projects continue https://ko-fi.com/gcodegearhead 

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# Intro 
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The Low Rider MMU is heavily based on the following MMUs, and credit must be given where it is due. My project aims to build on these and contribute to the open source community.

• CN3D - MMX 

• LH Stinger - Pico MMU 

This is designed to be a simple relatively low cost MMU which has less moving parts to align and tinker with. The idea is it can be mounted to the side of a printer or underneath a filament rack etc. and take up minimal space. The fact that it looks interesting, like its thinking, when in operation is also good reason to keep it out on display. 

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# Update Log
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15-DEC-2025

Added 625-2Rs Bearing option

07-NOV-2025

DXF for mounting holes & Step file Space Claim

30-AUG-2025

V2 in testing Reduce bearing count, simplify gear, easier switch geometry…… 

26-JUL-2025

Corrected BOM QTY. 

19-JUL-2025

Added Notched NEMA14 Motor Plate

18-JUN-2025

Release Angle CAM 19T addition, along with 38T Servo gear for full 360deg rotation. 
Manuals updated with settings for this combo. 
Motor Plate updated with notch for alignment
Shoutout to @Amfkuna for doing the testing on this. 

17-JUN-2025

Updated Filament Feed Body to correct ECAS hole print orientation

16-JUN-2025

Added PC4 M6 and M10 Connector Threads

11-JUN-2025

Updated Mechanical Manual BOM and CAM Print info

10-JUN-2025

CAM Shaft that requires no support

05-JUN-2025

M4 Mountable Walls (Add M4 screws of length you need to BOM)

04-JUN-2025

2 Lane CAM Shaft
NEMA 14 Adapted Motor Plate

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# Assembly Instructions
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Download the Manuals supplied below. 
I assume you know how to flash an EBB board, if not follow the linked wiki pages. 

• Low Rider MMu - Mechanical Assembly

• Low Rider MMu - Electrical and Programming

• I have included a folder with my config of the 4 Happy Hare files you need to edit, this is for your cross referencing.

This is intended to give you a starting point, it is by no means comprehensive. 
You will need to tune your purge volumes, change to a blobifier, etc etc. 
This is to help you get going and lower the barrier to entry to MMU units. 
 

You can pair this with my spool holder 
https://www.printables.com/model/1193075-4-5-spool-filament-dispenser-sv08-coprint-config-t 

You can pair it with my Park Blob Poop for the SV08
https://www.printables.com/model/1328600-park-blob-poop-sv08-pbp-sv08 

Here is a calibration test for tuning 
https://www.printables.com/model/1322272-mmu-orca-flush-volume-test 
 

This is a DIY project with multiple interfacing parts which move in close proximity to each other. 
The quality of this project is strongly dependent on the accuracy of your printer, quality of your prints, and how well you pay attention to the details.

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# Print Settings
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• PETG

  • Lever Arms to be printed 

• Clear PETG

  • LED Covers to be printed in Clear PETG

• All else in PLA / ASA / ABS

• Layer Height,- 0.12mm

  • Filament Body / Filament spaces, Levers 

  • Top Bottom Layers 6

• Layer Height - 0.2mm

  • LH / RH wall 

  • Top Bottom Layers 4

• Walls - 4 at 0.4mm thick

• Infill 15%  Gyroid

• Supports 

  • Yes for parts listed in Build Manual

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# BOM
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Due to the sheer number of requests for kits, there is now one supplied from Blurolls3d. 
You can find it here.

Parts

Qty

Link for info

EBB42 V1.2 (no Max31865) 

1

Use the No-Max version
https://biqu.equipment/products/bigtreetech-ebb-36-42-can-bus-for-connecting-klipper-expansion-device?variant=39760665247842 

LM2596 DCDC Buck

1

Neo Pixel LEDS GRBW

4

MG996r Servo

1

Nema 17 Stepper Motor

1

Heat Set Inserts M3 OD5 L5mm

14

0.2mm2 / 26AWG wire

As Required

Small Zipties

As Required

(approx. 5)

Limit Switches D2FC NO+NC

4

Solder

As Required

M3 x 25mm

4

M3 x 15mm

2

M3 x 8mm

5

M3 x 6mm

5

M3 x 4mm

7

M3 Nuts

5

M3 Washers

10

M2 x 10mm 

8

GT2 Belt 6mm x 186

1

https://www.amazon.de/-/en/dp/B07D92M6P2?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 

GT2 Belt 6mm x 122

1

https://www.amazon.de/-/en/dp/B07D93VTFV?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 

GT2 20 tooth pulley 5mm OD

2

Bearing F695

5

Can use 3 bearings spaced one on each end and one in the middle

https://www.aliexpress.com/item/32850989216.html 

Bearing 685

2

https://www.aliexpress.com/item/1005003141324807.html 

BMG Dual Extruder Gears set

4

https://www.aliexpress.com/item/1005005249662532.html 

OD 3mm Shaft L=108mm

1

OD 5mm Shaft L=135mm

2

M3 threaded Rod L=108mm

3

ECAS04

8

6x3 N35 Magnets

8

5mm Steel Balls

4

PTFE Tubing OD=4mm ID=3mm L=20mm

4

For levers

PTFE Tubing OD=4mm ID=3mm

As required

Routing from spool holder to MMU and MMU to printer