Printer: Creality CR-10 Smart
My axial fan, which cools the heatsink, broke down. I replaced it with a cheap knock-off fan, as it was the only option available. However, this replacement caused temperature fluctuations that went beyond the acceptable range.
Here's what I tried to fix the issue:
I initially tried flipping the direction of the axial fan to make it blow hot air instead of surrounding air. This seemed to work for a while, but it caused heat to build up, and my 3D printer's filament stopped extruding from the nozzle.
I attempted to lower the current supplied to the fan, thinking it might help. However, this turned out to be a bad idea, as I wasn't sure how much current the main board could safely supply through this port. The result was that the resistor I used got fried.
I then decided to mount a 740 Ω resistor in series to create a voltage drop, leaving about 10 volts for the fan. Unfortunately, this also led to heat build-up.
Finally, I tried mounting a 320 Ω resistor, leaving about 14.5 volts for the fan, and this seemed to work fine.
I'm concerned about heat dissipation and the overall reliability of this solution. What are your thoughts on this?
The issue stems from the small size of the heatsink and the large size of the axial fan, which directly faces the heat block. I'm now considering the option of mounting a 24 V, 3x3 cm fan and creating a custom mount for it.