@dc42 said in 12v Water Pump on a 24V System:

We recommend that you do not run water pumps that used brushed DC motors from the fan outputs. This is because the starting current for a brushed DC motor is usually many times the running current, and will probably exceed the 4.4A rated current of the bed mosfet.

If your E1 Heat output is free then you can use that to drive the water pump; but then you must use an external flyback diode.

Maybe add that to the warning about adding diodes to brushed motors in the wiki for completeness? (And good catch!)

@tgarr No worries about the thread digging, altough quite old, it is still as relevant as it was. In fact I just started a print with the exact same effector design as posted here. The 4th axis attachements are still evolving and I do have some minor changes planned to the effector design but noting major.

I don't use any special washers or something like that. Just the 6 screws (with a regular washer on top) that thread into brass heat set inserts.

In terms of calibration results here's the full DWC output string 🙂 . That is for a 180mm probe radius on a 400mm diameter bed.

Calibrated 8 factors using 18 points, (mean, deviation) before (0.018, 0.046) after (-0.000, 0.043)

The results are certainly more consistent across the entire bed compared to the FSR's I used to use. I am honestly not sure if the 0.043mm deviation is considered good for a 400mm diameter bed.

2021-01-01 14.56.23.jpg