SV08 Max / SV Zero Multicolor Toolhead Upgrade by CN3D

⚠ Note: These parts are printed in ABS with tight fits. ABS shrinkage and warping can affect tolerances, so proper filament tuning is essential. We strongly recommend watching our filament tuning video before printing.

Before you start building, head over to the Files tab and scroll all the way down to “Other files” — you’ll find a full step-by-step PDF manual there.

👉 Trust me — read the manual first.
It will make the whole build process much smoother.
The manual includes both the full BOM and a complete list of required tools

💡 Want this upgrade on your Sovol SV08 or another printer?
You can install the Sovol Zero toolhead (affiliate link):
USA 
👉Buy here Affiliate link – Sovol Zero toolhead  https://tidd.ly/4pgwrdx 
EU
👉Buy here Affiliate link – Sovol Zero toolhead https://tidd.ly/48LDSTi

With the Zero toolhead you get:

• ⚙ Planetary drive with hardened gears

• 📡 Eddy current probe

• 🔌 CAN toolboards

• 🛠 Everything you need for a solid toolhead in 2025

• And on top of that, we’re offering CN3D upgrades to make it:

• ✅ Lighter

• ✅ Ready for MMU (with dual filament sensors)

• ✅ Equipped with a filament cutter

So whether you buy the full Zero toolhead or just add our cover/shroud, you’ll unlock the airflow performance we showed in this video 🚀

👉 If you want to install this on a Sovol SV08 (standard), you can upgrade to the Sovol Zero toolhead first:
Affiliate link – Sovol Zero toolhead Buy here https://tidd.ly/4pgwrdx 

We have made another upgrade for the SV08 Max / SV Zero 3D printers.
⚠ This upgrade can be used on the SV08 only if you have the SV Zero stock toolhead.

This mod upgrades your toolhead to be multicolor-ready and adds several functional improvements.

🔧 What’s New / Key Benefits

• Dual filament sensors

  • 1 sensor before the extruder

  • 1 sensor after the extruder

• Integrated filament cutter

• Improved toolhead shroud

  • Uses a dedicated toolhead fan

  • Significantly improved part cooling airflow

  • This is the same improved shroud we already published, now integrated into this upgrade

Here you can see how to salvage your parts from your existing toolhead.

🧰 Required Parts - Bill Of Materials 

Hardware & Electronics

• Sovol Zero Toolhead https://tidd.ly/4pgwrdx  

• 1× 2510 axial fan (24V) – recommended: 12k rpm GDS Time https://s.click.aliexpress.com/e/_c3U3UuOd 

• 1× OLFA Japan blade  https://s.click.aliexpress.com/e/_c3WNzxiD KB4-F/5

• 2× mini microswitches https://s.click.aliexpress.com/e/_c3bZZ2dj  Straight

• 2× 3.5 mm ball bearings https://s.click.aliexpress.com/e/_c3zETvZP

• 4× M3 nuts  https://s.click.aliexpress.com/e/_c4lPbwYZ

• 1× M2.5 nut  https://s.click.aliexpress.com/e/_c44eINNf

• 1× M2.5 heat-set insert (M2.5xL3xOD3.5) https://s.click.aliexpress.com/e/_c3olfaYD

• 10× M3 heat-set inserts (4.5 mm OD × 3 mm length) https://s.click.aliexpress.com/e/_c3olfaYD

• 4× M3×16 screws https://s.click.aliexpress.com/e/_c4lPbwYZ

• 2× M3×8 screws https://s.click.aliexpress.com/e/_c4lPbwYZ

• 2× M2.5×15 screws https://s.click.aliexpress.com/e/_c44eINNf

• 1× M2.5×18 screw https://s.click.aliexpress.com/e/_c44eINNf

• 4xM1.6x6 screw https://s.click.aliexpress.com/e/_c3TIgUO5

• 4× N52 neodymium magnets (4×4×3 mm)  https://s.click.aliexpress.com/e/_c2IPiWhb

• 1× ECAS04 fitting  https://s.click.aliexpress.com/e/_c3CvbE0v

PTFE Tubing

• Before the extruder:
  PTFE tube 3 mm ID / 4 mm OD (ideal for long distances) https://s.click.aliexpress.com/e/_c4eF0BvR

• After the extruder:
  Creality Capricorn PTFE with 1.9 mm ID https://s.click.aliexpress.com/e/_c2QaLQJB 

Wiring & Protection

• Thin electrical wire for filament sensors

  • 4 wires × 20 mm  https://s.click.aliexpress.com/e/_c3L4RlrL

  • Use 2 colors (one color per sensor)

  • Ground wire can be shared

  • Example: 2× black (ground), 1× purple, 1× gray

• 10–15 mm of soft velour or electrical tape

  • Used to protect the Eddy probe PCB wire

🔧 Recommended Tools

For this project we highly recommend a precision hex key set that includes 0.9 mm, 1.27 mm, 1.3 mm up to 3 mm.
These small sizes are essential, as M1.6 screws require very small hex keys, and tolerances can vary depending on the screw manufacturer.

This set covers everything needed for this build and offers great value for the price.
https://s.click.aliexpress.com/e/_c3TE0JmD 

🖨 Printing Recommendations

• Material:

  • ABS (recommended) – lightweight and high-temperature resistant  Polymaker Aff Link 

• Walls:

  • Minimum 4, ideal 5

• Infill:

  • 20% gyroid

  • If using grid: 30%

• Top layers: 5

• Bottom layers: 5

• Layer height: 0.2 mm

All parts were tested in Polymaker PLA, and the final version was printed in Polymaker ABS.
Thanks to Polymaker for providing filament for testing.

❤ Support & Affiliates

Affiliate links to all parts used in this project are included.
If you choose to build this upgrade using those links, it will not cost you anything extra, and it directly helps support us in developing more upgrades like this.

⚡ Toolboard Fan Wiring

Recommended fan: 2510, 24V, ~0.06A 

For Sovol Zero:

Connect to PA2 and 24V (see wiring diagram in repo)

In Klipper: declare as toolhead_fan and configure it to turn on when extruder > 50 °C

[generic_fan toolboard_fan]
pin: extra_mcu:PA2 
heater: extruder
heater_temp: 50.0

Simple and reliable
Fan switches ON when the extruder > 50 °C
Fan switches OFF when the extruder cools down
No extra sensor needed
✅ Best if you just want a “follow the hotend” fan behavior

OR

[temperature_fan toolboard] 
pin: extra_mcu:PA2 
control: watermark 
max_delta: 3.0 
sensor_type: temperature_mcu 
sensor_mcu: extra_mcu 
min_temp: 0 
max_temp: 100 
target_temp: 38.0 
max_power: 1.0 # 100% 
shutdown_speed: 1.0

Uses the MCU’s internal temperature sensor
Fan ramps automatically to keep MCU around 38 °C
More precise thermal control, especially in enclosed printers
Will stay on even if the hotend is cold, if the MCU is heating up
✅ Best for toolhead boards inside hot chambers (like SV08 Max with enclosure)

⚡ My recommendation

For open printers (or if you want simplicity): use Option 1 (generic_fan).

For enclosed printers or if you want the fan only when the MCU gets hot: use Option 2 (temperature_fan).

This is for the SV08 MAX 

The simplest solution is to connect the fan directly to the hotend cooling fan’s V+ and PWM wires, since this board does not have any spare fan ports.

There are other wiring options if you want independent fan control, but in practice this isn’t really necessary. If the hotend is powered, you’re most likely printing anyway—so it makes sense for the toolboard fan to run at the same time.

The simplest solution is to connect the fan directly to the hotend cooling fan’s V+ and PWM wires, since this board does not have any spare fan ports.

There are other wiring options if you want independent fan control, but in practice this isn’t really necessary. If the hotend is powered, you’re most likely printing anyway—so it makes sense for the toolboard fan to run at the same time.

Alternative Solution (Advanced / Optional)

# 4th fan via BLTouch CTRL -> MOSFET IN
[fan_generic toolboard_fan]
pin: PB1                 # <-- REPLACE with BLTouch CTRL pin on the toolhead MCU
max_power: 1.0
shutdown_speed: 0.0
cycle_time: 0.010        # 10ms PWM (good general starting point)
hardware_pwm: False      # set True only if your MCU pin supports hardware PWM