DIY MMU2S clone

Last crawled date: 4 years, 2 months ago

Build your own DIY filament changer
Help me to buy new rolls/hardware for testing ;)
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Update
update 3/3/20
docs

update 25/2/20 :
documentation 1.0 (see PDF in file section)
update 6/2/20 :
add block support for gear motor with ball bearing, so the 5mm rod is supported by two ball bearing
add case top that allow fixing on 2020
This thing a little howto for building a DIY MMU2s for a printer with an skr 1.3 board on the printer and a skr mini (or gt2560) in the MMU2s.

What you need to print :
MMU2S
MMU2S ("mmu2s unit" directory ) :https://www.prusa3d.com/downloads/others/MK3orMK25toMMU2S_upgrade_stl.zip
Extruder
Recommended : https://www.thingiverse.com/thing:3626993
or classic MK3s mmu2s (directory "mk3s or mk25s extruder") :https://www.prusa3d.com/downloads/others/MK3orMK25toMMU2S_upgrade_stl.zip
MMU print upgrade :
Ease filament insertion : PTFE insert MMU :https://www.thingiverse.com/thing:3233579
orhttps://www.thingiverse.com/thing:3657251
Better selector upgrade :https://www.thingiverse.com/thing:3528314
Stl available here
What I customized and you can download in file section:
MK3-mmu2s IN with PC4-M10 compaticle with 6-in1 splitter
skr mini box for the MMU
MMU support for 2020
block for gear stepper
block for idler stepper (with inside ball roller)
ASSEMBLY
Extruder
Recommended extruder : https://www.thingiverse.com/thing:3626993
But if you want the orginal extruder :
For assembly of the MK3s-mmu2 extruder :https://manual.prusa3d.com/Guide/5.+E-axis+assembly/1055?lang=enhttps://manual.prusa3d.com/Guide/3B.+MK3S-MK2.5S+-+extruder+upgrade/1070?lang=en
Original prusa stl : https://www.prusa3d.com/prusa-i3-printable-parts/
MMU2S
For assembly of the MMU2s, you can use the official documentation :https://manual.prusa3d.com/c/Original_Prusa_i3_MK3S_to_MMU2S
Marlin version addon
Klipper version addon
Wiring the SKR-MINI
Marlin
3 drivers (DRV8825, TMC220X, A4988 ...) and configure the jumper to 1/16 to X Y and E0
X to selector Motor
Y to idler Motor
E0 to gear/extruder motor

Connect PINDA to X MIN
BROWN = +5V
BLUE = GND
BLACK = SIGNAL

Color selector to Z MIN pin
RED = SIGNAL
BLACK = GND

Filament extruder switch ( IR sensor on the extruder) to Z MAX pin
VCC = 5V
S = SIGNAL
G = GND


Add for wire from the SKR 1.3 (TFT) to the SKR MINI (TFT)
GND = GND
TX = RX
RX = TX
Z MAX Signal = RESET


Klipper
Firmware
Marlin
SKR MINI
Custom firmware for the MMU2 with a skr mini or GT2560 board (replace prusa firmware) :https://github.com/kakou-fr/mmu2s-clone
You can/must customize the file /mmu2-diy/config.h to indicate the size of your bowden tube
#define DIST_MMU_EXTRUDER 690
#define DIST_EXTRUDER_BTGEAR 30
And flash the SKR MINI with this firmware.
Printer
You can use My modified Marlin firmware (with my SKR 1.3 config) :https://github.com/kakou-fr/Marlin
Or use the last version of Marlin 2.0 bugfix
For the Marlin configuration, see the file MMU2S-clone-guide_v0.1.pdf
Klipper
Install the last version of klipper (https://www.klipper3d.org/Installation.html)
The MMU2S configuration is in the file : https://github.com/KevinOConnor/klipper/blob/master/config/sample-mmu2s-diy.cfg
you can include this file in your printer.cfg by adding (at the end of the printer.cfg) :
[include klipper/config/sample-mmu2s-diy.cfg]
Modify the parameter in the section PARAMETER TO ADAPT TO YOUR SETUP to match your setup
Howto to use it
ASAP
Marlin version
Klipper version
BOM
for screw, refer to prusa assembly guide (and buffer guide), you need a lot of M3/M2 screw

other :
PTFE 3x4mm (filament roll <-> buffer <-> mmu <-> extruder, i used 7 meter)https://www.aliexpress.com/item/1M-PTFE-Tube-Clear-Teflon-PiPe-to-J-head-hotend-RepRap-Rostock-Bowden-Extruder-Throat-For/32535510253.html?spm=a2g0s.9042311.0.0.27426c374OHBk7
PTFE fit (PC4-M6 x5 (mmu in))https://www.aliexpress.com/item/Pneumatic-Connectors-Bowden-Extruder-J-head-Hotend-for-OD-4mm-or-6mm-PTFE-Tube-Quick-Coupler/32809884127.html?spm=a2g0s.9042311.0.0.27426c37G5AlWi
PTFE fit (PC4-M10 x12(buffer x10, mmu out, mk3s in))https://www.aliexpress.com/item/Pneumatic-Connectors-Bowden-Extruder-J-head-Hotend-for-OD-4mm-or-6mm-PTFE-Tube-Quick-Coupler/32809884127.html?spm=a2g0s.9042311.0.0.27426c37G5AlWi

mk3s extruder
24V blower (5015 turbo) :https://www.aliexpress.com/item/5015-4010-4020-12V-24V-Cooling-Turbo-Fan-Brushless-3D-Printer-Parts-2Pin-For-Extruder-DC/32874940278.html?spm=a2g0s.9042311.0.0.27426c373ckTlm
24V fan (4010) :https://www.aliexpress.com/item/5015-4010-4020-12V-24V-Cooling-Turbo-Fan-Brushless-3D-Printer-Parts-2Pin-For-Extruder-DC/32874940278.html?spm=a2g0s.9042311.0.0.27426c373ckTlm
hotend 24v Ptfe inside :https://www.aliexpress.com/item/Trianglelab-Highall-metal-v6-hotend-12V-24V-remote-Bowen-print-J-head-Hotend-and-cooling-fan/32844028127.html?spm=a2g0s.9042311.0.0.27426c37BKNwat
btech clone gearhttps://www.aliexpress.com/item/1Set-Cloned-Btech-Dual-Gears-DIY-Prusa-i3-Steel-Pulleys-Kit-3D-Printer-Gears-Extrusion-Wheel/32885613357.html?spm=a2g0s.9042311.0.0.27426c37nC13mZ
filament sensor IRhttps://www.aliexpress.com/item/Mk2-5-Mk3-To-Mk2-5s-Mk3s-Latest-3D-IR-Filament-Sensor-Upgrade-Detect-Stuck-Filament/32976750770.html?spm=a2g0s.9042311.0.0.27426c37nC13mZ

MMU2S
stepper (1.7A x3) :https://www.amazon.fr/gp/product/B06Y4NYJWN/
spring 15mm (2 for mmu, 1 for mk3s) :https://www.aliexpress.com/item/20pcs-compression-spring-wire-diameter-0-5mm-outer-diameter-4mm-Stainless-Steel-Micro-Small-Compression-spring/33021741010.html?spm=a2g0s.9042311.0.0.27426c37nC13mZ
coupler 5x5 (1) and 5mm x 8mm (1)https://www.aliexpress.com/item/Kande-Bearings-1pc-5x5-5x8-8x8-3D-Printer-Accessories-Aluminum-Couplings-Ship-Model-Couplings-5-5/32869281876.html?spm=a2g0s.9042311.0.0.27426c37nC13mZ
skr mini (1 for mmu)https://www.aliexpress.com/item/BIGTREETECH-SKR-mini-V1-1-32-Bit-Control-Board-ARM-CPU-32Bit-3D-Printer-Parts-TMC2130/33011542798.html?spm=a2g0s.9042311.0.0.27426c37nC13mZ
Clone gear (the one I use)https://www.aliexpress.com/item/5pcs-Filament-Gear-Motor-Gear-Filament-Pulley-For-Prusa-i3-MK2-MK2-5-MK3-Multi-Materials/32956124800.html?spm=a2g0s.9042311.0.0.27426c37nC13mZ
or Gear MK8 ( MK8 D) x5https://www.aliexpress.com/item/MK7-MK8-Extruder-Drive-Gear-Bore-26-36-40-teeth-5-8mm-For-1-75-3/33001874597.html?spm=a2g0s.9042311.0.0.27426c37DT28yh
rod 150mmx5mm (need to cut to the correct size with something like a dremel, 5x 16mm)https://www.aliexpress.com/item/RC-Stainless-Steel-Rod-shaft-Linear-Rail-Round-Shaft-Length150mm-Diameter-3mm-2mm-2-5mm-4mm/32297671032.html?spm=a2g0s.9042311.0.0.27426c37G5AlWi
leadscreww 150mm (you can cut it to correct size or not :))https://www.aliexpress.com/item/Lead-Screw-100mm-150mm-250mm-300mm-330mm-350mm-3D-Printers-Parts-8mm-Trapezoidal-Screws-Copper-Nuts/32971570416.html?spm=a2g0s.9042311.0.0.27426c37G5AlWi
pinda (x1)https://www.aliexpress.com/item/Prusa-i3-mk2-mk2s-F-I-N-D-A-Probe-Compatiable-With-mini-rambo-For-DIY/32909754101.html?spm=a2g0s.9042311.0.0.27426c37OzLD9y
rod and laiton tubehttps://www.aliexpress.com/item/1-Set-Prusa-i3-MK3-Multi-Materials-2-0-Aluminum-120mm-Smooth-Rods-And-Brass-Tube/32956496462.html?spm=a2g0s.9042311.0.0.27426c37OzLD9y
metal ball for pinda (7mm)https://www.aliexpress.com/item/10PCS-Pack-Durable-Bicycle-Stainless-Steel-Ball-Replacement-Parts-2mm-3mm-4-763mm-5mm-6mm-7mm/32965688089.html?spm=a2g0s.9042311.0.0.27426c37EssjEm
ptfe capricorn clone 1m (inside the mmu, you need to cut small part and drill the in)https://fr.aliexpress.com/item/32889180926.html?spm=a2g0o.productlist.0.0.6ae726a5l2HjaF&algo_pvid=5320d311-e6ed-491d-959b-b89e051e53d6&algo_expid=5320d311-e6ed-491d-959b-b89e051e53d6-9&btsid=24dc803f-a53a-459e-9c8e-f489c849b701&ws_ab_test=searchweb0_0,searchweb201602_6,searchweb201603_55
bearings : 625-ZZ bearings (x10)

What i use in my printer
LV8729 extruder driver (1)https://www.aliexpress.com/item/LV8729-stepper-motor-driver-4-layer-substrate-ultra-quiet-driver-LV8729-driver-support-6V-36V-full/32812173457.html?spm=a2g0s.9042311.0.0.27426c37nC13mZ
tmc2209 (x/y)https://www.aliexpress.com/item/Pre-Sale-BIGTREETECH-TMC2209-V1-1-UART-Stepper-Motor-Driver-Stepsticks-Mute-Driver-VS-TMC2208-TMC2130/33028054557.html?spm=a2g0s.9042311.0.0.27426c37OzLD9y
skr 1.3https://www.aliexpress.com/item/BIGTREETECH-SKR-V1-3-Control-Board-32-Bit-ARM-CPU-32bit-Board-Smoothieboard-3D-Printer-Parts/32980090169.html?spm=a2g0s.9042311.0.0.27426c37HDT5ir