Revo leaking filament during 49-point Z calibration
Hi, I installed E3D's Revo on my i3MK3S+. Then, performed a PID Calibration at 210c.
It seems to print OK but there is a problem that whenever the printer does the 49-point Z Calibration, filament leaks out while the extruder moves across the build plate. Small ball of filament is deposited whenever the nozzle dips down and traces of filament remains as the extruder moves. It looks like this mostly happens in the first half of the calibration. What is wrong? How to fix this?
RE: Revo leaking filament during 49-point Z calibration
I can't comment (yet) on the specifics of using the Revo hot-end, but you can modify the start G-code that your printer uses as it goes through bed levelling and heating.
For that, take a look at @bobstro's excellent 3D printing resources site here.
Specifically this section on using modified start G-code that does the bed-levelling at a lower 'no-ooze' temperature before heating up to final working temperature. The included 'prime-line' commands are also better from my practical experience.
I implemented this a while ago - I use it in all my profiles. Hope it helps!
Cheers,
Tim
RE: Revo leaking filament during 49-point Z calibration
Without immediately concluding that something is wrong (oozing is to be expected if there is pressure built up in the hotend while it is at printing temp), but myself and many others have had issues with the Revo heatercore printing at much higher temps than the thermistor is reading and sending to the printer. One person said that the reading on their MK3 went from 210 to 300 degrees while wiggling the two connectors to the extension cables. I myself noticed a lot of temperature fluctuations, excessive oozing (out of the ordinary) and all of my prints coming out shiny and much worse looking than my prints using a V6 on the same machine.
I'd recommend starting by trying out the custom start G-code that Tim mentioned, but if you notice that something is off, please investigate and contact E3D if you're unsure. Judging by the amount of people with this issue, even people that have gotten multiple defective replacements, i wouldn't say that it is unlikely that this could be part of your issue.
RE: Revo leaking filament during 49-point Z calibration
Thanks. For those with such issue, what is the color of their HeaterCore thermistor wire?
RE: Revo leaking filament during 49-point Z calibration
I can't speak for anyone else at the moment, but mine had a white thermistor wire and was produced back in march, according to the serial number.
I have just received a replacement heatercore today, this one has a navy blue thermistor wire and the serial number is dated within the last two weeks.
I know that people have been receiving faulty replacement heatercores all the way up until last week (again, don't know if they have the new thermistor wire), but I can't yet say whether this specific batch is improved, but I'm hoping so 🙂
RE: Revo leaking filament during 49-point Z calibration
E3D suggested doing a PID Calibration at 240c even I usually print at 210c. What is the purpose for that? Is it to serve as a bandage to mask possible issues?
RE: Revo leaking filament during 49-point Z calibration
That's the temperature i'd PID tune at for printing both PLA and PETG, not exactly sure what they think it will do for you if you only print at 210... I couldn't say if E3D knows something that i don't, but that doesn't sound like it could fix your problem in any capacity. Have you experienced any issues other than oozing and did you get a chance to try the anti-ooze start G-code? It works wonders for me.
You could potentially try tinkering with your retraction length and speed as well if you're getting blobs and zits during printing, i heard some people saying that theirs needed a little adjustment but i haven't done that personally
RE:
I tried the printer the past two days after leaving it alone unused. Strangely speaking, without doing anything, the problem disappeared by itself. Now there are two issues:
1. Sometimes some filament came out from the nozzle before it started printing. It was like dog dropping shit but the shit was still hanging from the body. The filament didn't drop to the build plate unlike previously reported. Do I need to worry about it?
2. It has happened twice (yesterday and today) that in the middle of the print jobs, nothing came out from the nozzle. The printer just continued the print jobs without filament coming out from the nozzle. Meanwhile, I heard ka ka ka ka sound from the extruder. This is annoying as it happened after printing several hours. What is wrong?
RE: Revo leaking filament during 49-point Z calibration
It probably has more to do with 240 being near the middle of the range of print temperatures the printer might be expected to operate at with the materials it is capable of printing, than E3D knowing something that you don't.
That's the temperature i'd PID tune at for printing both PLA and PETG, not exactly sure what they think it will do for you if you only print at 210... I couldn't say if E3D knows something that i don't, but that doesn't sound like it could fix your problem in any capacity. Have you experienced any issues other than oozing and did you get a chance to try the anti-ooze start G-code? It works wonders for me.
You could potentially try tinkering with your retraction length and speed as well if you're getting blobs and zits during printing, i heard some people saying that theirs needed a little adjustment but i haven't done that personally