Thanks for the input. The current printcore has about 118hrs on it. Will be ordering a couple new ones to have on hand as I am working on approvals to purchase the S5. I havent looked at the side fans, but the one in front seems to be working properly. I will try printing at 225*C and see if that helps and also keep an eye on the fans. If not, Ill swap back to ABS until the new printcores come in.
What do you recommend for print speed?
118 hours is not a lot. I suspect there is no PTFE aging but that doesn't mean there wasn't a "bad" lot of PTFE that had a slightly thinner inside diameter. But I'm thinking this is not the issue.
Your UM3 should have come with 2 AA 0.4 and 1 BB 0.4 cores. So you should already have another AA 0.4. Why not try that one?
Print speed? Well if the filament is jamming due to being too hot (common with ABS) then faster is better. For all other reasons slower is better (e.g. feeder can't keep up or too much friction somewhere or quality of print is also better when printing slower).
So actually I'd try both - you can do that in the TUNE menu on the printer while printing - speed up to 150% to see if you get a jam sooner. Or if jam issues go away.
We have had our UM3 for several years and its seen ALOT of hours. The original AA cores have been replaced. The only other AA core we have has about 42 days of hot time on it although it has been used for breakaway material and hardly ever actually extruding as we dont use it often.
I tried it again at 225C this morning and jammed up quicker. I swapped back to ABS now to get a print going I need done over the weekend.
I will try messing with the speed during the print, didnt think to do that.
Also for the fans, none of them were running during the short time I had the printer going, at least not while I was watching. I think I had the fan set at 30%?
3 hours ago, gregers05 said:Also for the fans, none of them were running during the short time I had the printer going,
If that includes the front fan then this would explain everything and your symptoms perfectly make sense. I'd check the cable going into the top of the print head. The rear two screws on top of the head come out easily and that allows you to remove the cover and you can reseat that cable. Careful - it doesn't just pull out so I'd leave it and just try pushing it down some more.
If you only mean the side fans well this sounds like a problem but a different problem. ABS doesn't really need much side fan but a tiny bit will improve the quality of ABS prints. Just a tiny bit of fan.
Question on the fans, because I have never really paid much attention to them. Should they be running 100% of the time while printing? When you set the fan % in Cura, that is 30% of max RPM correct? Currently none of the 3 fans are running however I had them set in cura to be running. Want to make sure they aren't supposed to be intermittently running and I am only checking them when they happen to be off during a cycle.
Sorry - I was on vacation the first half of this week.
The door fan should be on 100% if nozzles are above 60C and if that is off it explains your issue and is usually the cable where it connects inside the head. Again, if door fan is off this explains your issue and perfectly matches your symptoms.
The side fans are more complicated. Typically they are off for the first layer (for example). In Cura put "fan" in the search box (just above the detailed settings) and there are 8 settings in the cooling section that directly affect fan speed and possible other's that are more complicated but certainly those 8 settings come into play and you can hover over each one to see what they do.
HOWEVER, while it's printing you can just go into the TUNE menu and set the fan speed to 100% and you should hear them.
1
On 9/15/2022 at 8:18 AM, gr5 said:Sorry - I was on vacation the first half of this week.
The door fan should be on 100% if nozzles are above 60C and if that is off it explains your issue and is usually the cable where it connects inside the head. Again, if door fan is off this explains your issue and perfectly matches your symptoms.
The side fans are more complicated. Typically they are off for the first layer (for example). In Cura put "fan" in the search box (just above the detailed settings) and there are 8 settings in the cooling section that directly affect fan speed and possible other's that are more complicated but certainly those 8 settings come into play and you can hover over each one to see what they do.
HOWEVER, while it's printing you can just go into the TUNE menu and set the fan speed to 100% and you should hear them.
Thanks, I will look into that and check the wires also
Detailed, and simple, instructions:
https://ultimakernasupport.zendesk.com/hc/en-us/articles/115004226246-Printhead#“printheadcable"
1
On 9/16/2022 at 3:53 PM, gr5 said:Detailed, and simple, instructions:
https://ultimakernasupport.zendesk.com/hc/en-us/articles/115004226246-Printhead#“printheadcable"
perfect thanks!
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gr5 2,235
Test the front fan in the door (NOT SIDE FANS) - stuff can get in there after years and ABS won't care but PLA or PETG will and will fail just as you say like 20 minutes into the print typically with the filament kind of stuck in the print core. Fan should start spinning around when printcore reaches if temp rising 40C and stay on until below 60C if temp falling.
Seriously consider using a new core that you havn't used much. The higher the temp, the faster the PTFE inside the core ages. Again - doesn't matter as much for ABS if the PTFE is getting soft but a problem for PLA and PETG. So maybe go into the maintenance menu and look how many printing hours you have on each printcore.
keep temps low. I use 220-230C for PETG (on both my S5 and my UM2go and my UM3). And use a little more fan to get good overhangs and good looking prints (ABS barely needs any fan at all - PETG needs about half the fan of PLA which doesn't mean necessarily at 50% as my UM3 fan at 50% is the same as at 100% - on my UM3 I do 9% fan for PETG but every printer is different).
Some filaments - particularly ABS - will clog if at too high a temp for too long. Normal printing temps like 240C for ABS left at 10 minutes (without printing - just sitting in the nozzle) will turn the ABS into a gum-like mess that is hard to get out of the core.
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