Reasonable chamber fan limit
The Core One chamber fans are quite noisy when running at the default maximum speed of 40%. When I received my Core One, I experimented with turning the fans completely off while keeping the ventilation grill open and the enclosure door closed. With longer prints this led to a clogged extruder with PLA because of heat creep, which is expected.
However, due to the fan noise I'd like to keep the chamber fan speed as low as I can. I can experiment with doing long prints at various chamber fan speeds to see when heat creep starts to cause problems, but that takes a lot of time. So does anyone have some better understanding of how low could I go with the fan speeds without suffering from heat creep? The room temperature is somewhere around 22-23°C. The noise level is much more tolerable at 30% fan speed and below.
RE: Reasonable chamber fan limit
You'd better to remove the top panel and cutoff the chamber fan, eventually let the door open like on competitor's printers. You can find mods to help with that, sliding top panel or only elevated to let more hot air go out.
The problem by reducing the chamber fan speed is that to avoid heat creep, the Nextruder fan will need to blow more to keep the heatsink temperature acceptable. And this fan is not a lot quieter when at full speed.
RE: Reasonable chamber fan limit
What are the options for replacing them with quieter fans such as https://soundproofgeek.com/quietest-computer-fan-silent-pc/ ?
MK4S/MMU3
RE: Reasonable chamber fan limit
Quiet computer fans are made for 12V. Core One is using server fans running at 24V. So we are looking for quiet 24V PWM 60x60x25 fan. When I was briefly looking, I did not find any.
RE: Reasonable chamber fan limit
You could use a buck converter to go down from 24v to 12v.
But usually silent fans cool less, that's why they are silent. Moving air makes noise.
RE: Reasonable chamber fan limit
You could use a buck converter to go down from 24v to 12v.
But usually silent fans cool less, that's why they are silent. Moving air makes noise.
This is nonsense. The buck converter cannot be used because the voltage of the fans at 24 V is controlled by PWM.
RE: Reasonable chamber fan limit
I was looking at specs and it seems like both 24V and 12V fans with 4 pin wires uses 5V logic signal for PWM and RPM sensor. So it should be possible to use step down converter from 24V to 12V for fan power wires. Noctua makes some fairly expensive converter NA-VC1 for this purpose.
The only complication is that Core One firmware expects some RPM of fans. According to firmware release notes it should be at least 4800 RPM to pass the test.
RE: Reasonable chamber fan limit
This is nonsense. The buck converter cannot be used because the voltage of the fans at 24 V is controlled by PWM.
Nope...
You either control the fan speed by changing the voltage (for fans with 3 pins).
Or you use PWM where you send pulses (hence the P in PWM) to control the power going to the motor (for fans with 4 pins). The voltage on VDC pin 2 stays the same all the time. So a step down converter will work.