Low profile mainboard fan mount for Sovol SV08

This is a remix from Ibot_3D to fit a e.g. 120mm fan to the base plate of the Sovol SV08 printer.

Attention: This is for a hardware mod to replace the loud & small mainboard fan with a bigger silent fan. You will lose your guarantee and it may not work with all replacement fans.

• This will need to cut the base plate to fit the fan halfway inside the base.
• This will need additional risers for the feet to get enough clearance for air flow. Longer M-screws required. (e.g 30mm) I used sv08 riser.stl from GERGOPRINT3D from his SV08 fan mod.
• This will need a 2pin 24Volt (!) silent fan for additional temperature control. I use a 24V 120mmx25mm fan (29,6 dBA). 
• Cable ties to fix the stepper motor cables on the mainboard and not getting into fan blades
• Fan grill inside to stop cables touching fan blades
• Fan mesh outside for dust protection (use fan frame spacer https://www.printables.com/model/1048881-120mm-fan-frame-for-mesh-distance )

(Or use a 12V fan with buck converter, but you will lose the ability to control the fan over mainboard temp sensor, see printer.cfg code. The buck converter is not PWM compatible with 2-pin connectors, and then the fan doesn't spin at all when using the code below. 12V fan will work and spin at fixed speed voltage adjusted. Remove all code for pin: PA1 and it will spin forever. Do a long term spinning test!).

To make the 24V fan temperature controlled add this line to printer.cfg in Klipper:

• Attention: Test if the fan spins up again with higher temps, may not work with all fans (e.g. 12V fans with buck converter)
• This will shut down the fan completely when temperature at around 60°C and ramp up until full speed with higher temps. So the Sovol SV08 is completely silent when idle.

[temperature_fan CPUfan] # MOD mainboard fan control
pin: PA1
kick_start_time: 0.5
max_power: 1.0
min_temp: 0
max_temp: 90
cycle_time: 0.010
hardware_pwm: true
target_temp: 57
sensor_type: temperature_host
max_speed: 1.0
min_speed: 0.30
off_below: 0.32
control: pid
pid_Kp: 2     
pid_Ki: .5     
pid_Kd: 0.25     
pid_deriv_time: 5.0

Remix to fit a fan low profile on a base plate of SV08 or similar printer.