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philippe44

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  1. philippe44

    Why I've decided to ditch my UM2 (+)

    Thanks for the feedback. I'm currently printing with the glued gear. Cross finger, so far so good after a couple of hours
  2. philippe44

    Why I've decided to ditch my UM2 (+)

    I've received the answer from my reseller. He is willing to help but does not seem to be aware of a better part. "We've seen a few of these issues. In the short term it's possible to put a little bit of super glue and then tap it with a hammer so it is flush with the axel to get your printer running. I'll see if we have some extra motors with gears around for warranty." Currently, I'm running a test with the gear super glued ...
  3. philippe44

    Why I've decided to ditch my UM2 (+)

    Thank you - I've contacted my reseller now and I will see. Again, sorry for venting it's just that I've invested so much time in my UM2 then UM2+ upgrade that when I saw again a massive feeder motor + under-extrusion problem, I blew a fuse
  4. philippe44

    Why I've decided to ditch my UM2 (+)

    Here is an example, but interestingly enough, the gear can go forward or backward. I also saw that somebody did a longer gear, but I only print PLA and I expect that it will not be strong/hard enough
  5. philippe44

    Why I've decided to ditch my UM2 (+)

    Thanks for answering guys. Unfortunately, there is no screw to hold the gear on the axis. So once I resisted to hit my UM2(+) with a hammer and calmed down, I tried to superglue the gear on the motor axis - I hope it will work, but if not, I might really (really) get rid of it. And it's unfortunate because I think it's a very good printer ... when it works.
  6. I usually don't write such post, but my level of frustration with my UM2 (upgraded to 2+) has gone beyond a reasonable level. The UM2 was my first 3D printer in early 2014. I was new to 3D printing, but I'm a 25+ years of experience engineer. On top of doing that for a living, at home I do SW development, my own HW design, PCB, CAD etc ... just to say that although I do a lot of mistakes, engineering is my daily activity. The UM2 worked very well for a couple of month, and then it started to be an under-extrusion nightmare. I already posted here and I tried a lot of fixes: ended replacing the hotend, teflon tube, printing a few feeders and many other accessories, tried UM and other filament, all sort of T°. But the result was 70-80% failed prints, no matter what, unless I would do 0.1mm vert slow prints. I upgraded not so long ago with the UM2+ kit. Went reasonably well (had to tinker a bit with the X home switch) and then I was back to good quality prints. Recently, issues started again by filament not unloading. The feeder motor was running, but not the feeder, and it was not a problem of grinded material. I pulled the material manually and insterted a new one that was only loaded half way. Removing the feeder, I saw that the gear on the motor had went almost off the axis hence the motor was running, but not the feeder. Strange. I pulled the gear back and started again. 1 successful print then, same thing started again. This time, I put a tiny slice of PLA between the gear and the flat part of axis and pushed it back real strong. Same thing happended again. So, I'll stop there because I've now decided to ditch the UM2+. I have another printer which is far from being as good as the UM in term of print quality, but at least, once you know what to do, this other printer is reliable. You understand its weakness and when you're careful with these, it *prints*. The UM seems to fail randomly and defies logic in term of what cause creates which effect. That, as an engineer, drives me mad. Sorry for venting :-(
  7. Did you update the firmware? Yes I did (otherwise the feeder turns in the wrong direction)
  8. After almost a year of infuriating under-extrusion with my UM2 and trying everything (new head, teflon insulator, bowden tube, feeder and many other mods) I upgraded it with the 2+ kit. The mechanical work is not as smooth as described on the video :-) (my motherboard wiring was different) but I was able to get it done properly ... then when I switched the printer back on, the head crashed against the enclosure when homing. I switched it off immediately and dismounted again the motherboard cache to check for unconnected X/Y homing wires ... to finally discover that the new head dimension was different enough so that the fan hit the enclosure before the switch of the X axis could be actionned ... it was very infuriating that I had to heavily bend the small metal piece of the switch. I really think the UM could have made a bit fat warning about that ! So well, other than that, printings are now excellent, under-extrusion is gone !
  9. For me its more like, you fix one thing and another on flares up, but yeah I think my Girlfriend will leave me if I spent another night infront of my UM2 fixing it. I share your pain (I just received the upgrade kit today) but with the original one, after I decided to simply put the reel on the floor and let a good set of filament coils hanging to remove some tension, I saw massive improvment. I've replaced everything else before (feeder, bowden tube, filament guide, teflon insulator ...) without a consistent success. I'm under the impression that the (or some) filament when directly coming from the reel, is still too bent & stiff and is having too much friction in the teflon tube. You can easily feel that using a piece of bent filament and moving it into the insulator. Anyway, off topic and I know a lot has been already written about it, but just my 2 cents
  10. I have both (FFCP and UM2). I only print PLA, so my experience would be limited to that, and this is just one opinion, I'm sure some will strongly disagree :-). - The UM print quality if absolutely much better than the FFCP, using same resoluton and spending a reasonable amount of time "tweaking" them (I'm not the kind that goes crazy spending days and days tweaking) - On the FFCP, w/o a glassbed, object adhesion is a real nightmare but *once you've upgraded to glass bed* is prints with an incredible reliability - it just prints, period - The UM2, for the first 6 month I got it, was a real joy. It printed with an incredible reliabilty with the high quality. Then, things started to derailed and more than one year later, they are still totally unpredictable. I've changed the teflon insulator, bowden tube (tried new material as well), tried different feeder, changed the nozzel, tried all sort of T°, printed all sort of improvment pieces to prevent the tube from moving while retracting filament, it just remains totally unpredictable and I'can't print above 0.1 mm. I mean by unpredicatble a lot of under-extrusion. Whatever I do, some prints go well (30-50%) and all the rest either fail or are unusable and I've never been able to find a pattern. I'm using UM material, I've not tried to go cheap - I recommended a UM2 to a friend before I had this problem, he bought it and had the exact same experience: worked incredibly well for a few month and then became a nightmare - I've ordered the UM2+ upgrade kit and see how it will work, I'd really like to have it back as it was at the beginning because it was so perfect ...
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