Raspberry Pi 40mm Fan Mount, with access to camera port.

Simple Ras Pi Fan Mount that allows access to camera port.

I recently upgraded to a Pi4b on my Voron V0 and noticed the temps were significantly higher than the 3b, even in stand by.

This mount uses the standard Voron spec heat inserts x4 for mounting the fan.

I have increased the mounting hole size on my Pi with a drill bit by hand, this allows me to put an M3 screw through it into the mount for the pi, holding everything together like a printer parts, pi sandwhich.

Whilst this was intended for my Pi4b, it also fits perfectly on a Pi3b.

Printed using standard Voron settings in ABS. Other materials may work too. 

If using a 10mm fan, you can still use a back panel as there is a gap between them, although I'd reccomend drilling some holes in it where the fan is located to allow better airflow. 
 

Point to note, this will not work with the LDO input shaper board.

 

I've also added some bits to the printer.cfg that only turns the fan on when the pi reaches a defined temp.

(Prevents that constant drone of a fan when the printer is in standby)

 

[temperature_fan Raspberry_Pi]
pin:                                # Pin number that your fan is plugged into
sensor_type: temperature_host       # This is where the temp comes from, in this instance the RasPi
control: watermark                  # This prevents the need for PID control
max_power: 0.75                     # Number between 0 & 1, lower to slow the fan down and reduce noise, but also airflow.
cycle_time: 0.010
target_temp: 50                     # Temp you want the fan to kick in
min_temp: 10                        # Required for sanity check
max_temp: 100                       # Required for sanity check
shutdown_speed: 0                   # 0 = No fan when printer shuts down, 1 = fan comes on when printer shuts down. Max Speed must be 1 if turning this on, or klipper will throw an error.
You must comment out exisiting temp sensor for RasPi for the above to work, like in the example below
#[temperature_sensor Raspberry_Pi]
#sensor_type: temperature_host
#min_temp: 10
#max_temp: 100

This will still show up in your temp section in your interface, but shows the fan info too. 

 

PS: I know my heat syncs would be better flipped 90- degrees for better airflow, there are some new ones on their way to me ha!