Hi. i got a video of what happens on power on and when i press the reset button https://youtu.be/YOGZNTowwMc grettings tommy

@droftarts said in Expansion 3HC M906 not working properly: @deckingman purely speculation, and I think you’re thinking what I’m thinking, but if the same thing is happening to your extruder board it may be why there’s such a difference between prints, ie bad ones have zero motor torque at standstill, good ones motor torque is set correctly. Could be that the idle timeout or idle current setting is set to 0, somehow? Unfortunately M84 doesn’t show the idle timeout, just cancels it. Ian Trying to keep an open mind, but over the course of the last 19 months, I have had 3 extruder motors fail - well I assumed at the time they had failed because they either wouldn't turn or had very little torque. IIRC, I would likely have tried a different motor on the same driver but that would have meant that I cycled the power (because I never plug or unplug anything on a "live" board). If that worked, I would have assumed a duff motor and would not have gone on to try the same motor on a different driver. When the last one failed, I assumed that they must have been a bad batch so I replaced all 6. One can't help wondering............

Ok, so today i do not get the heater fault. The only thing that is changes from yesterday is the ambient temp was around 22 yesterday, and today it's 24 because it's cold outside. Yes the part cooler was off. I did the readings without it faulting. I took a reading roughly every 5 sec. https://pastebin.com/X6bZzbAZ

@droftarts Yes, I posted about this issue https://forum.duet3d.com/topic/21264/firmware-restart-while-refreshing-dwc-and-pausing and confirmation https://forum.duet3d.com/topic/21489/known-issue-unsafe-to-use-external-sd-card-slot

@deckingman yes, you do, you sent me a roll of 3mm clear filament! Oh no! He’s got my address! Going into hiding... Ian

@zapta said in Curious audible pitch change with varying move length.: Does RRF even support the notion of multiple independent gantries? For example, when we define max speed or jerk, can we have separate specifications for (XY), (AB) and (UV)? Yes you can.

The reason for the "bad curve fit" message is that the measured gain is so high, because of the very high heater power. The maximum gain (M307 'A' parameter) allowed is the higher of 1500 and (500 + M143 limit). So your original tuning results were well above the limit: M307 H2 A3249.8 C542.5 D6.8 Your second was within a whisker of being OK: M307 H2 A1505.2 C605.4 D7.5 S0.5 Had you reduced A to 1500, you would have avoided the "bad curve fit" message.

@3DPMicro Another problem with stall guard is that it can be affected by motor temperature, which can make it unreliable. Dropping the motor current when homing can also be a useful safety feature to implement (and it's free and easy to do).

The VIN reading reads low if you connect the PanelDue to the wrong connector. When using the ribbon cable it must be connected to CONN_SD, not CONN_LCD.

@Surgikill said in Trouble setting up mains heated bed on RRF 3.x: M950 H7 C"!exp.heater7" T0 do you have a duex? if so thats the wrong name. duex pins start with duex

Lol, it seems like once again I got fooled by a clone. So I did a continuity test and found out that the pwm pin number 7 isn't connected to anything. So it'll be easy, I'll just have to solder a wire from it. Also, while I'm at it, here are some prints I did with the printer during the past months: Some large molds to pour silicone: Fairings for my electric motorbike: And also for fun a giant moai head: Each of those prints took less than 20 hours. As you can see, the printer works very well, I havent' got any issue with it since I repaired the fried motherboard. My next print should be much bigger and take around 36 hours, it'll be a really huge mold to make the bike's fairings out of carbon fiber. The mold should make around 3kg of PLA. Got myself a few 5Kg spools fot that job. But before doing that, I'd like to test and possibly install the closed loop system, in order to make the printer as realiable as possible.

@fcwilt Phaedrux answered my question already, but regarding the part you don't understand: My gantry weight about 30lbs on that printer. When you move 0.2-0.5 lbs around you can stop really fast and change direction without too much issue. When you move a big machine it is a bit different: You have to calculate acceleration and deceleration. Thank for the M558 A/S, I will look into it. I don't think they are set properly on that machine.

@3DPrintingWorld Oh, my bad reading too fast:) I checked this a few times yesterday.There is no loose pulley on the motors

@gnydick said in Using duex.pwm4 as fan???: @fcwilt I LOVE YOU!!! it works. OK... good to know. Glad I was able to help. Frederick

I'm looking forward to trying this new version. I haven't moved beyond the original yet, and I've got dying process issues on my Pi that might be related to how I hacked that together. John

@dc42 Dear dc42, First of all, thank you very much for the always quick and kind reply. I've tried following your advice, One of three boards could be made with firmware v3.1.1 + Bootloader v1.3. I repeated the test with this. I thought it was OK with firmware v3.1.1 + Bootloader v1.3, but there was a problem. When 3HC is disconnected from every cable (include CAN) and only power is connected, does not the DIAG red LED flash at all, just off state. Repeated plugging in and unplugging the CAN cable, the red LED starts blinking. The other 2 3HC are still ICE"ICE-state" (I don't know what to call it in English. I call it'ICE'. power-on, no response, no blinking, do nothing state) Disconnected the 3HC board from CAN and set the address to zero (all switches off), does not the DIAG red LED flash at all, just off state. The 3HC is not connected to CAN in any way. In my experience, I suspect the bootloader 2.2. the bootloader procedure seems to be stuck in the CAN init loop. Even when it worked normally in the past, sometimes (30% probability) there was a situation where it was suspected that booting was delayed. Because I found a case where the contents of config.g were not passed to 3HC. So, I put "G4 S2" (delay 2 seconds) at the beginning of config.g. I hope you try to reproduce the same situation as me. And 1LC looks fine.

You've got a house wiring problem. I see two solutions short of trying to get by with a DC powered bed heater. run another line from the load center to a dedicated outlet for your printer get a suitably rated dual-conversion UPS to power your printer Frederick

@Peter120 said in G30 inductive probe auto nozzle height calibration: If you print a block with a height equal to the nozzle Z offset the printed block can be used as a calibration surrogate object. Probe the bed with G30, move the probe over the top of the block and probe the top with G30 S-3 and the difference from the bottom to top of the block is loaded as the new nozzle Z offset value Well since the size of that block is a constant how does measuring it differ from just using the constant as the Z probe trigger height? I don't think you can use the Z probe as a measurement tool to calibrate itself. Any variations in trigger height are going to apply to both the G30 and the G30 S-3. Or am I missing something? Frederick

@Phaedrux Thank you, that did the trick!

@fcwilt thank you that's a massive help, will try that out tomorrow and let you know how it goes

@FeedingFilament said in dual z axis sync and bltouch issues..: @fcwilt I am trying to figure out the height of the offset for that from the center of the bed. Then I lower the nozzle to 0, I adjust the bed with the paper, I do a height test to know how high it is and I modify it in the config.g. This is how I configure the distance from the nozzle to the bed. OK now I see what you are doing. I always install a Z axis endstop sensor so I can home all my axes first and start from there - so my approach to determining the Z probe trigger height is a bit different. Frederick

@Phaedrux Thanks a lot!

@fcwilt said in IDEX CoreXY, With Only 2 Motors.: Nice graphics! Do you do that sort of work professionally? Frederick These are the Voron .step files. Someone has put a lot of work into creating them with all the correct colours. I am just building on it in Fusion 360. I guess you could call what I do a profession haha. I quit my job in the Automotive trade to pursue my 3D printing business from what started out as a hobby 7 years or so ago. I mostly focus on engineering related 3d printing, but the bulk of what I print is PLA investment casting patterns (I dont do the castings, just supply the patterns). Before you ask, yes we print a lot of cool sh!t that gets cast in metal, but I generally cant share most of it. But one of the coolest ones was this public sculpture, all of the spheres and the bendy straw collars were 3d printed and investment cast in bronze, the straight pipe is off the shelf. We went big straight out the gate as this was the first thing we ever investment cast with 3d printing. Another cool one was this motorbike Cylinder head. Any my ugly mug holding the very intricate printed pattern.