Auxilliary Cooling Fan using a 5015 Blower Fan for the Voron V0 3d-Printers.
The Shroud can be easily installed after the Printer has already been fully assembled, as it just slots into either the left or right bottom extrusion and gets clamped onto the extrusion. For added security you can use some VHB-Tape.
The Shroud comes in 2 Versions: A Unibody Version for which you'll need a larger Printer as it is 170mm long and a 2 Piece Version which you can print on a V0 and glue together after printing.
I have not done any CFD-Simulation on this shroud, so it definitely could be better.
After some testing with PLA, the effective cooling area is only around 1/3rd of the the print-bed. I'm working on a new Version using a larger blower fan, however that will need some time, as I currently don't have any bigger blower fans.
For Comparision Pictures of the cooling Performance of the Auxilliary fan check the Overhang Tests Document.
You'll need a way to connect the fan, there are a few ways to do this:
The easiest way would be to use a Fan-Port on your MCU, however most MCUs are already completely occupied by the Hotend-, Partcooling- and Controller-Fan. So you would need a MCU with more Fan-Ports, like the Mellow Fly E3 Pro v3 which has 4 Fan-Ports while having the same footprint as an Ender 3 Board (like BTT SKR E3).
Because Klipper supports multiple MCUs you could add another MCU however this one would need to be very small to fit the electronics compartmens of the V0. One option would be Timmit's Klipper Expander over on the Voron-Hardware Github.
By using a CAN-Bus Toolhead board you are freeing up 2 Fan-Ports on your main mcu, because your hotend and partcooling fan are now connected to the CAN-Board. This would allow you to connect your auxilliary fan to the mcu.
Alternatively you can run the fan of a GPIO-Pin of your Pi by using a Transistor or MOSFET. There are quite a few guides online on how to do this, like this one from SENSORSIOT. You can ignore the Python-Script, as we will control the fan through Klipper (see Klipper Configuration). The IRLZ44N MOSFET has worked fine for me for both 5V and 24V Fans.
If you have LEDs or a Camera mounted to the underside of the Y-axis extrusions these will likely collide with the fanshroud so you might need to move the LEDs to the top.
| Part | Quantity | Notes |
|---|---|---|
| M3x5x4 Heatset Insert | 5 | |
| 5015 Blower Fan | 1 | 5V or 24V depending on your setup |
| M3x16 BHCS | 3 | |
| M3x18 BHCS | 2 | |
| M3 Washer | 2 | optional, only to make better contact with the fan |
| Superglue | only for the 2-piece shroud | |
| VHB-Tape | for extra mounting security if needed |
You'll need to print 1 Clamp_Block.stl and either the Shroud_Unibody.stl if you have a large enough printer, or Shroud_2Piece_Bottom.stl and Shroud_2Piece_Top.stl if you print it on a V0-sized printer.
- Unibody Version
- 2 Piece Version:
Insert 2x Heatsets For the fan from the front. CAUTION the printed part is 5mm thick, so the Heatset is exactly the same length as the part. Don't push the Heatset through by accident.
2 Piece Version only: Apply Glue to the outside surfaces of the bottom part duct and glue the two pieces together.
Attach the clamp-block with 3x M3x16 BHCS and clamp the shroud to the bottom extrusion. Afterwards check that your Toolhead does not collide with the Shroud when it's all the way to the right!
You can route the fan wires through the top slot of the extrusion past the electronics panel to the electronics compartment and hook up the fan.
All the values for the settings are what works for me with a GDSTIME 24V Dual Ball Bearing Fan. You might need to adjust these for your setup.
Copy the included aux_fan.cfg to your klipper config folder and add [include aux_fan.cfg] to your printer.cfg.
Edit the aux_fan.cfg and replace the PIN in the [fan_generic Aux_Fan] section with the pin you have your fan connected to.
Klipper does not support controlling aditional fans with M106 and M107 by default, so i added some replacement Macros wich include a selection parameter P kinda like Marlin does. Index 2 gets matched to the Auxilliary cooling fan, because that is how BambuStudio controlls the auxilliary cooling fan.
Be sure to add a M107 or M106 P2 S0 to either your PRINT_END-macro or in the end-gcode of your slicer to make sure that the auxilliary fan and partcooling fan stops. Often there is only an M106 S0 executed at the end, which only turns off the partcooling fan but not the Auxilliary fan.
The aux_fan.cfg also adds Controls for the auxilliary fan to the Display in the Control Menu, so you can also control the fan with an V0-Display.
These new controls should appear right beneath the partcooling fan inputs, if they don't you might need to adjust the index value in aux_fan.cfg.
...
[fan_generic Aux_Fan]
pin: PB7
...
Config-Example: Fan controlled with MOSFET connected to GPIO13 on your Raspberry Pi and your Pi is configured in klipper with a [mcu host] section:
...
[fan_generic Aux_Fan]
pin: host:gpiochip0/gpio13
...
After you have added the configuration to your klipper instance and reloaded klipper you should be able to control the fan using SET_FAN_SPEED FAN=Aux_Fan SPEED=XX where XX is a (decimal-) number between 0 and 1 (1 being 100%, 0.5 = 50% and so on).
If you are using Mainsail or Fluidd you should see an Aux Fan Slider right under the normal Partcooling-fan control, with which you can also set the fan speed.
There is no widespread support for auxilliary cooling fans in slicers.
The only one i know of is BambuStudio and its Forks (e.g. OrcaSlicer). The way BambuStudio controls the auxilliary cooling fan is by sending a M106 P2 Sxxx, where xxx is the speed on a scale of 0 to 255. That is why there is a included Macro for Klipper that allows this G-Code to function with klipper.
In the Filament settings window in the Cooling section set the auxilliary Cooling fan speed to what you want. This will enable the fan to the set speed after the first layers where the partcooling fan is disabled.
In the Printer settings under Basic inormation enable the Auxilliary part cooling fan setting. Then in the Filament settings set the fan speed to your wanted speed (like with standard BambuStudio).
Because the shroud leans against the outside panel there could be some unwanted vibration noises. To lessen this you could add a bit of foam tape to the back of the shroud, however use thin foam tape to avoid the shroud leaning forward into the movement area of your toolhead.