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    feeshfeud

    @feeshfeud

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    Latest posts made by feeshfeud

    • RE: Large Bed Heater Tuning Tips

      The first thing I would try is to leave the chamber open, with a small fan if necessary to provide some ambient airflow. Don't cool the bed here, but try and keep the ambient temperature constant. This should give you a tune appropriate for door-open or first warmup. You'll then want to assess if you have any excess oscillation issues once everything is warm - if everything is tight enough (for me, within 1C or so would probably be fine, but it's your machine). You can try manually tweaking the parameters from here, or even try averaging 'open door' with 'closed door' parameters if performance isn't to spec.

      Slightly more elegantly, but with a more involved integration, adding a prerun macro in the printing process to switch from 'warm-up' tune to 'steady-state' tune should be possible. You'd need to work out the cleanest way to integrate this into your slicing/printing workflow.

      Then the kludgy option is to create a 'warm-up macro' for the first bed turn-on where temperature is ramped up slowly enough (e.g. 5C increments) that the heater fault doesn't occur.

      An even kludgier option would be to reduce the max PWM of your heater. I'd wager you could get that bed up to temp with ~25-40% of 4400W. (Measuring your steady state wattage would give you a real number). This would obviously be slower to warm up, but might mitigate things like chamber temperature (which will now have time to equilibrate).

      posted in Tuning and tweaking
      feeshfeudundefined
      feeshfeud
    • RE: Connecting High power 12V fan to Duet 3 6HC

      @war4peace They are electrically in parallel, but plumbed in series. So each receives identical an PWM signal from the board for RPM and iirc 18V from the independent supply. Flow is in series, doubling the pump head to better deal with narrowish tubing and ~6ft of static head on startup. Sorry if that wasn't clear, didn't want to confuse the point about wiring an external supply. Since they are plumbed in series I don't really want independent speed control, and tach isn't overly important as I tend to just set them to ~85% max at boot and leave them there[0].

      Connections in detail: The board connection (Duet3 mainboard) is one of the 4 pin fan headers (e.g. out 4), via a fan extension cable where I've snipped the power/grnd wires (leaving PWM/tach). That extension then connects to a 4 pin 'fan splitter' y cable which connects to both pump motors' stock signal connectors.

      For power I just rigged a 2 x molex (standard ATX / computer 4-pin) 'Y' cable to a ground/pwr pair of leads. The power / ground wires are soldered to a (comically oversized) diode which I bent into a U shape and inserted into a screw terminal type 'universal' laptop power adapter (DC barrel to 2 x screw terminal connector). Not sure the diode is strictly necessary, but it was an excuse to break out the soldering iron and it cost all of 40 cents on digikey.

      Doing a single fan/pump should be the same without the y-splits.

      [0] I'm not in front of my machine right now, so I might be misremembering and the pumps might just not have a tach signal -- which would obviously explain why it doesn't work.

      posted in Duet Hardware and wiring
      feeshfeudundefined
      feeshfeud
    • RE: Connecting High power 12V fan to Duet 3 6HC

      @nurgelrot I can vouch that running power separate and PWM/tach from the board works fine (or at least mostly). I use a laptop charger plus flyback diode to power a pair of d5 water pumps in parallel and the PWM control works fine. I've never got the tach to read right but I assumed that was due to the parallel arrangement and presumably would work just fine with 1 pump or fan.

      posted in Duet Hardware and wiring
      feeshfeudundefined
      feeshfeud
    • RE: Setup temp01 sensor on Toolboard for ambient

      It's possible. I can't say that this is the most correct way of doing it but I've just configured my misc. temp sensors to unused heaters:

      e.g.

      M308 S1 P"temp1" Y"thermistor" T100000 B4138 A"radiator" ; configure thermistor for measuring radiator temp
      M950 H1 C"out8" T1 Q0 ; configure heater for 'extruder' (NOT USED)

      Here I'm not using H1 or 'out8' for anything. Of course configure to your thermistor and input ('temp1' for me).

      posted in Using Duet Controllers
      feeshfeudundefined
      feeshfeud