Hi all, I've recently received my E3D Revo (through the reseller 3DJake), and in general, it performs really well. After some comments from Stefan (from CNCKitchen) on the recent Meltzone podcast, I took a closer look at the temperature log in Octoprint howver and noticed some strange readings. First things first: This is on an original Prusa Mk3S+, everything stock except the extruder (obviously). I swapped the default Prusa Extruder for the Revo V6 replacement. During this print I used a .4 mm nozzle. PID tuned to 205°. During this print no draft or other exterior influence was present. I use a somewhat adjusted heatup routine, where the nozzle heats up to 160°, then does the bed level routine (the 160° prevent filament from oozing out during that), then heats up to final temperature (in this case, 205°) and starts printing. As can be seen in the temperature graph (attached), during the 160° phase, the temperature fluctuates somewhat. That itself wouldn't be as strange, but when heating up to 205°, at some point the thermistor seemingly stops reporting an increase in temperature, just to then jump to a massive overshoot (~230° at the peak). During the rest of the print the temperature seems stable at 205°, at least for now. This is a somewhat longer print, I will check again tomorrow and update if anything else happened. I gotta say, this behaviour looks like either the thermistor or heater has some kind of fault; does someone have similar issues or could explain why / how this is happening? Thanks, Florian
Hallo Jap beim prusa mini ist das mir auch passiert hatte ich auch das Problem von 170 nach dem bett level auf 130 und dann wider auf 205 und dann auf 258 Grad dann ging nichts mehr sehr komisch das Verhalten
I am having the exact same issue. Revo 6 on an MK3S. Otherwise stock setup. I have noticed this behavior when printing PLA at 210C, but it always seems to settle down. The graph below shows my first print with PETG on the REVO at 235C. It's not a PID control issue since it seems to hold steady for a while, then suddenly jumps around between 275C and 205C. Is this a problem with the heater/thermistor?
I read / heard somewhere (I think it was on the "Meltzone" podcast) that there seem to be some issues with a small percentage of the thermistors (maybe a bad batch or something?). I contacted the E3D technical support, after some investigation (proof of purchase, serial number etc.) they sent me new heater core, which works flawlessly (and collected the old faulty one). You might wanna contact them, too.
Great, thank you. I have just submitted a support ticket. I also just purchased a Revo Micro for my Mini. I hope it doesn't have the same problem.
Natalie at E3D support helped me and is having a new heater core sent to me. In the meantime I had ordered a new Revo Micro and a spare heater core. I tested both the heater core from the Micro as well as the spare heater core in my MK3S and both seem to be working properly. I will test the replacement heater core when it arrives.
Hallo das ist ein großes problem mit revo 6 mini auf meinem prusa mini https://www.youtube.com/channel/UCG5csg3PhOc0OX1aeI20pSA
I´ve been having the same prob. for about 2 weeks now............... After rebuilding the printer about 3 times/flashing firmware and PID tuning I don´t how many times. I had a brainstorm moment and figured out it must be the Revo 6 thermistor. I almost rebuilt everything back to my stock V6. Contacted E3D and a new one is to be sent.............THE BEST CUSTOMER SUPPORT EVER! Happy printing.
Unfortunately, the replacement thermistor sent by E3D has been acting up. Hopefully, they will replace it again.
E3D comes through again, another replacement on the way. I hope they get through the presumably bad batch of cores...
And unfortunately the replacement of my replacement is starting to fail now. Is there any official response from E3D about this problem?
Mine failed after maybe 80 hours of printing. Did probably a dozen PID tunes total, no cigar. Started out as extremely abnormal temperature reading variations (fluctuations of 30 degrees C in a matter of seconds), particularly during heatup and especially when targeting higher temperatures. This would often cause a thermal runaway situation. The thermistor has also since developed another issue where it seems to be grossly under-reporting temperatures. Even after temperatures apparently stabilized at 210C (for PLA), it was coming out like a low viscosity liquid-- slightly bubbling and sometimes even smoking. Swapped back to the original V6 and all is well, so it's definitely the Revo. E3D support is fine, they're sending a replacement out. But I have to admit, I have very low confidence in Revo right now. This seems to be a very common issue (see Reddit and discord). Lots of people are on their second or even third replacement. That's more than just bad luck; there's something more fundamentally wrong here. Hoping it's just QA issues in E3D's thermistor sourcing.
In the same boat. This will the the third core to fail on my MK3S. The Revo Micro core on my Prusa Mini seems to be working OK, but I don't have Octoprint on that printer. I would only see a problem if I'm looking at the printer display.
FYI, E3D tech support is great and has issued another replacement. Hopefully the issue has been fixed, but we'll see.
I've got he same issue several times and I believe to have identified the issue! I've installed the Revo on my Prusa MK3S some months ago and it worked fine until after some weeks I started to experience bad printing quality as if the nozzle temperature was overheating, in fact when I measured the nozzle using a thermocouple it was +65°C higher then what was displayed on the screen. When that happens the temperature curve also starts displaying erratic behaviour. Last time when I investigated the thermal runaway event, the issue disappeared after having removed the Revo heater body and reinstalling it again (the same one). Today (some weeks after) the thermal runaway reappeared and all I did was to mingle with the quick connect connector and the problem was solved. My conclusion here is that the issue it not the E3D body or the thermal sensor inside the body but a bad contact at the quick connect terminals. This also explains way most people here experiences the problem only after some time > basically because the contact resistance (by oxidation) increases over time due to moisture. Then when it happens braking the contact and mating it again corrects the contact resistance...at least for some time. So I strongly urge E3D to have a look at the connector specs because it don't match the requirements for the thermal sensor.
