Welcome to the SeeMeCNC Community

I finished building the Rostock Max V3 and when I turn on the power the PEEK fan just runs constantly. It runs when the Hotend is room temp, during prints (obviously) and after it has cooled back down to room temp. (Just in case I wasn't clear enough, the PEEK fan never shuts off)
Built with just the Stock Kit and online directions, nothing special, I haven't tried messing with the config yet...

I'm assuming something is not correct because I'm comparing it to my V2 PEEK fan which only runs while hot.

Is that normal for the V3? Maybe I have a short somewhere in my fan wiring or a config issue?

My upgraded V2 with the HE280 doest the same. I think that is normal now with the new wiring.

It's not a PEEK fan - there's no PEEK in the hot end.

The fan does (and should) run constantly as there aren't enough wires to control the cold-section fan separately.

g.

geneb wrote:It's not a PEEK fan - there's no PEEK in the hot end.

The fan does (and should) run constantly as there aren't enough wires to control the cold-section fan separately.

g.

Since you are running I2C to control the accelerometer, what are the chances of doing a future variation of the HE280 that cuts the wiring down to Just 4 wires (+12/GND/SCL/SDA) and using an I2C GPIO IC on the hot end to expand the I2C bus into the various switching control signals for multiple fans/lights/hot ends?

I'm not doing anything. You'll need to ask SeeMeCNC directly.

g.

U.S. Water Rockets wrote:

geneb wrote:It's not a PEEK fan - there's no PEEK in the hot end.

The fan does (and should) run constantly as there aren't enough wires to control the cold-section fan separately.

g.

Since you are running I2C to control the accelerometer, what are the chances of doing a future variation of the HE280 that cuts the wiring down to Just 4 wires (+12/GND/SCL/SDA) and using an I2C GPIO IC on the hot end to expand the I2C bus into the various switching control signals for multiple fans/lights/hot ends?

I know Dave crocker (DC42, duet firmware dev), was thinking of doing something similar. and mentioned in on the reprap forums. Maybe ask him as well.

One problem is that the I2C protocol is pretty susceptible to data errors from external electrical sources, especially with long wiring. I think that may be why the probing is always done cold, so the heater is not turning on and off.

I2C isn't really a great choice... It's meant for short lengths... 3ft is kind of pushing it.. Serial would have been the better choice.