SV08 Enclosure case fan - how to make it spin?

Sovol SV08
1

I installed the Sovol SV08 case fan, but without printer.cfg modification it does nothing.
It should be temperature controlled by the MCU temperature, but i can’t get it running with MCU temperature set in printer.cfg. In fact it doesn’t run with standard printer.cfg at all. Any solution?

1 Like
2

I believe it’s only on when printing something that needs a hotter temperature such as ABS. It only does that if told to by an instruction in the slice file. The Sovol slicer includes that instruction if it’s designated as an ABS model. Other slicers presumably won’t. I’ve not tried it myself but seem to recall that’s what I read so I could be wrong.

3

Octo slicer has a exhaust fan setting. I think it is under machine setting
Or there is a G code command
M106 P3 S255 I think this is right
Fan 3 at full speed
Fan off
M107 P3

4

I don’t want the chamber fan to spin at full blast all the time, this makes no sense.
It should be temperature controlled with the readings of the print head mcu.

I get it working with host-temperature readings (=mainboard cpu temp in the base plate), but not for mcu-temp above the nozzle (sensor_type: temperature_mcu). Want to avoid heat creep after the heat break, so the fan starts to spin if there is too high chamber temp.

Here my not fully working printer.cfg code, it does work but false temp sensor:

DELETED THIS:

[fan_generic fan3] # exhaust fan
pin: PA2
max_power: 1.0

AND REPLACED WITH:

[temperature_fan fan3] # temp controlled exhaust fan
pin: PA2
kick_start_time: 0.5
max_power: 1.0
min_temp: 0
max_temp: 90
hardware_pwm: true
target_temp: 57
sensor_type: temperature_host
max_speed: 1.0
min_speed: 0.23
off_below: 0.25
control: pid
pid_Kp: 2
pid_Ki: .5
pid_Kd: 0.25
pid_deriv_time: 5.0
5

Sound like you want to adjust the actual hotend fan, (not the part fans or exhaust fan), speed dependant on the chamber temperatures.

But this could cause the hot air from inside the chamber and blow that hot air on to the hotend.

So I think no real major advantage.

If you think you have heat creep then that could be something else.

For example: check the pin the holds the gear wheel in on the feeding leave arm, is it starting to come loose.

Unless you have your “own heater” in the chamber, enclosure, then temperature inside only get to about 35C anyway so I would not thick this would cause heat creep if that is what it is.

One issue with most 3D printers is that an issue can be something else.

Hope I don’t sound critical here, trying to help unseen.