@wilriker Would help if we knew exactly what was going on.

Also, if all is he looking to do is change power at the heater block he can change the PWM duty cycle and get the same results. If he's looking to increase power draw on a FET or something then he would need some power resistors.

@mrehorstdmd @zapta @mendenmh @mwolter @arhi I just replaced the Igus bushings with the LM16UU I ordered. No more issues. Now I have no idea what to do with all these Igus bushings I have.

I fixed it. I think there were some cold solder joints on the 6 pin connectors I made up. I reflowed them and it all works now.

@dc42 said in EMI affecting IR probe?:

@Surgikill said in EMI affecting IR probe?:

I'm still puzzled as to why the duet reads a bunch of random garbage with the new wire. I thought I should expect a 0 value, a 535/536 value, and a 1000 value ONLY.

If the output wire of the IR sensor is not connected to the Z probe IN pin, then you will get garbage readings because the input to the ADC is floating.

It is wired correctly. The output pin of the IR probe is connected to the Z probe in pin. I just triple checked with a multimeter, the wiring diagram, and my old wiring harness. The multimeter was reading 0.1 ohms for total resistance as well. I can try to measure capacitance if you think that might be causing the issue with the twisted pair.

@dc42 I still have the issue with it even with the filament sensor unplugged on both ends. I checked the crimps on both ends and found that one pin wasn't seated all the way in the connector. I seated it and I am still having problems. I'm going to check solder connections on the 6 pin connector next, but I measured resistance on each line and all seemed fine.

I'm still puzzled as to why the duet reads a bunch of random garbage with the new wire. I thought I should expect a 0 value, a 535/536 value, and a 1000 value ONLY.

So I still have the old cable for the IR probe laying around. I plugged it in and the IR probe works as intended now. So there has got to be something wrong in the cable I made.

I measure the resistance on all the wires for the IR probe, and they are 0.3 ohms or less. I plugged the new cable into the duet and measured a voltage of ~3.16V between the data pin and ground, it showed a reading on the panel due of around P960. I plugged the old cable into the duet and measured a voltage of ~0.660V between the data pin and ground, it showed a reading on the panel due of around P170.

I'm not sure what could be causing this. I pinned the connectors correctly. The older cable is longer and has portions of cat5 on it. Any idea? I'd really like to use the new cable.

What's really confusing is that with the old wire, the IR probe works exactly as intended, showing 0, then only showing 535/536, then showing 1000. With the new wire the value bounces all over the place.

@mrehorstdmd In my case, I watched a guy on youtube who had great success with the CF rods and IGUS bushings, so that's why I went with it. That was the only time I had seen it done.

Hey all,

I just re-did the wiring harness on my corexy. I had some high grade connectors lying around, and I wanted to make everything modular so I can just pop the whole extruder assembly off. This meant that I wired the IR sensor and filament sensor together. I used CAT 5 cable to wire them together. As you might know, these use twisted pairs. I took a twisted pair and used it for power and ground on the IR probe, and the same for the filament sensor (laser filament sensor). Then I took a third twisted pair, and used it as the data line for both. One wire goes to the IR probe, one wire goes to the filament sensor. However, I am having issues with the IR probe now. It is showing a reading of around 520 when not triggered. I was able to get it to read 0 and homed the machine, and then I started manually pulling filament through the laser filament sensor, and I watched the value on the probe readout slowly creep up.

Is there a way I can fix this? Maybe put a choke on one of the wire bundles, or a pulldown resistor?

@mrehorstdmd @zapta @mendenmh @mwolter @arhi I just replaced the Igus bushings with the LM16UU I ordered. No more issues. Now I have no idea what to do with all these Igus bushings I have.

@zapta Yea I was looking at those but I wasn't going to pay 20-30 dollars a bushing when I need 8 of them. I'll just stick with the regular bearings. Are there any recommendations on good bearings? I have all chinesium ones right now, but if I find out that it does end up fixing my problem, I'll most likely upgrade to better bearings.

@mwolter Yup. I've had the same issues where they're either too loose or too tight. Hopefully the LM16UU fix that issue.

Hey all,

I'm designing a block to hold my laser filament sensor. I was reading the wiki and noticed they were mentioning different geometries for the back plate, and some draft angle for the opening where the laser shoots down.

Here's what I cad'd up.

Any input on it? It's a 15 degree draft angle and there's a small pyramid on the bottom to get rid of stray IR light. The filament edge is about 9mm away from the sensor. I have the filament path enlarged because I am using screw in bowden connectors. I don't have any black filament handy, but I'm printing it with orange to see if it works at all.