LNMC

Awesome, printed a test Robot at 210 and it came out great, looks like the Teflon was our main problem, we ordered a few of those TFT Teflon parts to throw on our printers. Oh also I'm going to document the lifespan of this stock Ultimaker Teflon part I just replaced. I'm going to check it every 150 hours to see how far along it's gotten in terms of burning, we'll most likely print at just 210 but occasionally up to 225 so it should be an accurate take on how many hours you can get out of the stock ones at 210 regular printing with PLA. I'll make a new post to document the process once I've got it started. Thanks for all the help!

No sooner then a few minutes after I post do I manage to pull the Teflon piece out, I just used a small scraper for painting to get some leverage underneath and pop it out. Our suspicions were correct though! Completely burnt coupler! At least we know what the problem is now, luckily we actually had a spare one so I'm going to replace it now and get back with how it's printing, thanks for all the help, we're going to look into the Olson blocks and some of those couplers you linked earlier Thanks again!

Thanks for the help gr5, I tried to remove the coupler this morning but it seems to be stuck to the Nozzle, any ideas of what I could do to remove it, I don't want to pull to hard on it just in case of damaging the nozzle or something. Thanks!

Thanks for the info I'll look into the teflon you mentioned, and it's not a new problem, we print quite well for a few hundred hours then it begins to go downhill. It happened last year with our old printer eventually and we ended up changing the head which solved most of our problems, but obviously we don't want to be changing the print heads often. It's starting to happen again with both of our printers this year now. I'm guessing the underlying problem is that we are just pushing them too hard maybe, I don't think they were designed for 1500+ hours running constantly. I've tried just about every trick and tip in the forums and nothing seems to help other than raising the temperature above 240 which is definitely not ideal. My only other concern is maybe the spool is having a hard time being pulled by the feeder, right now its just on the back of the UM2 with the default spool holder, we have a few other printers around the campus and they area using a custom made spool holder that seems to have drastically improved their printing, we're currently getting some made for our own printers, I'll post an update if it improves! Thanks!

Hey, thanks for the reply, I should have mentioned I've cleaned using the atomic method and also on the other end of the nozzle using a needle, it tends to to curl up no matter what, but I'll give it another try with cleaning. And no I haven't tried changing the Teflon yet (we'd have to order a new one) but I'm more curious generally how long these last (in hours preferably) so we can look into ordering multiples at one time for future replacements, is it safe to assume 1000+ hours is a lot? I'm not sure how many hours the UM2 usually gets in a household setting compared to ours, but it's more or less running the entire day 7 days a week. I'll post an update if anything changes! Thanks

Hard to tell form the picture and without seeing your print settings (or how large the print actually is), but I'd try slowing down the print for something this small and see how that goes first.

Hey guys, I work at a Media Center at my University and we have 2 UM2's, both have extreme under extrusion, I've been working with them for about a year now and have done as much research on the forums as I can but can't seem to find the root cause for our under extrusion, it seems to change on a daily basis. Sometimes it prints great, sometimes it's horrible. Things I have done: Atomic method / cleaned nozzle, looks perfect. Adjusted the spring on the feeder at the back (It's at the top but have experimented with other placements with no effect, or worse) Adjusted printing settings several times based on recommendations on the forums Leveled build plate Changed / tried different color filament Oiled up the machine Updated firmware/Cura Other Observations and Notes Material stops coming out completely when machine retracts for about a full second (causing huge gaps in the prints) The material tends to "curl upwards" when it initially starts coming out and grabs on to the nozzle, sometimes i have to use a piece of PLA to get it off the nozzle. EVERY time I abort a print I have to remove the bowden tube and cut the end of the PLA off as it gets thin at the end and can't push through the nozzle Has only ever used PLA (Specifically from UM), never ABS As these printers are for University use they both get extreme use (roughly 72 hours a week), I wonder if maybe they are just being used far too much and we're wearing them down really quickly. We've had the print head on our original UM2 which we got around September 2014 changed and it's working fairly good, it has problems right now but I suspect it's just due for some basic maintenance. Our new one is experiencing extreme under extrusion though, the only way I can solve it is by cranking the temperature to 250 or above. Anything lower has extreme under extrusion. I only printed this high for testing the Ultimaker Robot print, it usually runs at 210-225 max. I'll give you the printer settings and cura screen shots, but the files we put on the SD cards are handled by multiple people on multiple machines so I can't guarantee everyone's settings are the same (Perhaps we should ensure we all use a default go to setting for average prints and only change upon need). I've suspected it could be the Teflon insulator, but the machine is fairly new, how long do these usually last before needing to be replaced? Here are my cura settings Here are some prints - For the robot on the left I adjusted the printer up to 225 (from 210) and that's the result. The one on the right (which is still not as good as I'd like) was tested at 250, which is way too hot to be running for PLA let alone for 72 hours a week. This was also printed at 225 and came out horrible no matter how many tries and adjustments made. And here is one that printed about a month ago with the exact same settings which looks pretty decent for a low-normal quality print. We don't use high quality settings as it's for students to use and if we made every print high quality it would take forever for students to get their prints. Any and all help is appreciated!