I'm a little confused about the direction of my Z axis/probe on my Corexy printer. My reasoning is that the Z value should represent the distance between the nozzle and the bed. So when Z increases, the bed should move away (down) form the nozzle. To achieve this, I have to set M569 P2 to S0. But when I send G30 the bed moves away from the probe, resulting in an error. I've tried M569 P2 S1 to move the bed up when Z is increased, and switched the Z minima/maxima in M208 to counter this. And now the Y axis (which I left untouched) takes off and crashes into the end stop after it activating it on homing. I switched Z back in M208 but left M569 P2 on S1 and now I can home again with the Z axis reversed. But much to my surprise, G30 still sends the bed away from the probe.

What am I missing? Shouldn't M569 P2 reverse the Z direction with G30? How should Z be set up in a CoreXY configuration?

@dc42 said in Quick question about connecting inductive Z probes:

The 1N5818 can be rather leaky so it wouldn't offer such good protection as a BAT43 or BAT85.

Thanks I'll order some BAT85.

I recently ordered a Z probe (LJ12 A3–4-Z/AX) which will arrive tomorrow. I thought it would be plug and play on my WiFi 1.03 but I just figured this only applies to 1.04 and later. I have a couple of 1N4148 and 1N5818 diodes laying around. The Z probe guide states that "a small signal silicon diode such as 1N4148 works for some people.." but that doesn't sound too convincing. Should I order proper signal schottky diodes or will a signal or schottky diode do the trick?

The guide also specifically states NPN normally open in the capacitive and inductive sensor part. The one I ordered is NC. Does this make any difference besides M574? I can't image it will but I thought I'd ask since I'm already posting here.

Thanks in advance

@wyvern said in How did I break the 5V rail?:

Did you by chance hook up the stepper with the duet powered on?

I didn't (un)plug any steppers, I'm aware of the fact that steppers shouldn't be hot-swapped.

@dc42 said in How did I break the 5V rail?:

I suggest you check the resistance of L3 using a multimeter. It should be lower than your multimeter can measure (0.04 ohms according to the datasheet). If it reads open circuit, than it has failed.

Lol how on earth didn't I think of this right away. It has been a long day for me.

It reads 1120k ohms, but when I reverse the polarity of the multimeter leads it somehow reads out of range (>2000k ohm). I don't know why this gives me a different reading but it's definitely dead. I'll order the inductor and bridge the pads in the meantime. Or I might use one of those tiny MP1584 boards that I must have laying around somewhere, they always come in handy.

I still wonder what happened. It could have been something simple like a bad inductor. Thanks to both of you. Especially to you dc42. I'm new to the 3D printing scene and I really enjoy working with the Duet WiFi.

When I was installing the Z axis on my printer (a work in progress) I noticed flickering and horizontals moving bars (like filming a CRT monitor) on my LCD. I lost internet connectivity and after a reboot the board seemed unable to load the printer settings from the SD. I plugged it into my PC via USB and everything worked fine. I immediately suspected the buck converter to be faulty.

I measured 2,7V on the 5V rail when the board was connected to a 6S lipo (used for troubleshooting, I use a 24V Meanwell in my printer) and the 3V rail showed ~1,9V. I was surprised to measure 4,93V on the top side side of the small inductor (L3) and 2,7V on the bottom side. Is it safe to assume this is the culprit? Because I also measured 4,93V on C98 and 2,7V on C99.

How did I break my board? The only thing I can think of is back EMF created by spinning the Z motor (doesn't the TMC2660 protect the board against these voltages?). I remember pulling on a belt en seeing some LEDs flash on the board. At the time, I only had 3 steppers and 3 end stops plus the PanelDue connected to my Duet 2 Wifi (v1.03). Also, what size is L3?

Thanks in advance