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matt-brailsford

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Everything posted by matt-brailsford

  1. By jove, I think we've got it! In the end it came down to 3 things 1) Too much tension on the X/Y long bands - removed all the tensioners I added 2) Not enough tension on the X/Y short bands - pulled these tighter 3) Too much friction at the end caps - loosened up and added some 3-in-1 oil Thanks everyone for the help, I'm so much happier with the results now and have a much better understanding of the tensions needed in the bands (hard to portray via text instructions so hard for newcomers to 100% know). Matt
  2. @gr5 thanks for the feedback. 1) I'll have a play with the leveling and see if I can't get it spot on. It was definitely leveled to be "just" touching the nossle, but I'll see if tweaking helps any. 2) I thought so, but thought it worth checking. 3) Yea, it's very exact as to when it happens hence why I doubted it being a slipping pulley. I'm pretty sure it can't be down to slack belts now as they are all pretty tight. The head unit for me has always been pretty stiff to move around, however earlier I did spray some 3-in-1 oil into the bearings behind the end caps which did seem to loosen it up a bit. I've tried oiling the rods themselves which doesn't seem to have made much difference so I'm thinking the only two things it could now be is like you say, too much friction on the end caps (is it worth printing some of these?) or possibly too tight Y bands?
  3. @IRobertl Oops, thanks for the heads up. I've uploaded them to a gallery now and updated my last post (I was struggling to figure out how to upload media so thanks for the link)
  4. Ok, it looks like I'm getting closer. I tentioned the long belts and realized I had the fan on backwards so switched that around and things are coming out somewhat better. I do still seem to have a few issues. If you take a look at these pics, you'll see there is a bit of layer shifting around the eyes / arms, however i don't believe this to be loose pulleys as once it gets past those eye/arm details, it shifts back to where it should be, so it seems when a new detail comes into print, it's struggling to come back in line. Could this be over-tensioned belts? Given that it does this on the front and the side though does that mean all belts could be over tensioned? Also, on the logo on his chest, there is a bit of stringing, but I'm wondering if this is just to be expected with the nature of the design (ie, it's bridging to mid air so there is nothing to hold it in place). That said, the bridging in his mouth also seems to have drooped a bit which I believe should have been able to print ok. PS this guy was printed upside down on his head facing the back of the machine should orientation make any difference to your advice. Cheers guys Matt
  5. Thanks guys, I'm just going through your recommendations and trialing them to see if any solve the issue. I've printed and added some belt tensioners which seems to have made it a bit better. Will try your other suggestions too. @gr5 I'm wondering if underextreusion is playing a part. On the first layer, it often prints the first line with blobs, which from looking around sounds like under-extrusion so I might try your suggestion next. I had to replace the standard small black gear of the feeder with a 3D printed part as the original snapped during installation so wasn't sure if this could have affected the amount of material being fed through.
  6. Hi Guys, I've just finished putting my UMO+ together and have run a few test prints through and seem to have some issues with gapping / incorrect widths. I've been through the visual trouble shooting guide here which seems to suggest it'll be down to belt tension. Having checked all around, I can't see any real issues. The smaller timing belts are as tight as can be, and the longer ones aren't very tight, but I believe that's fine. I've attached a couple of pics to highlight the problem. As you can see, there are places where the infill doesn't touch the outline, and on the B shape in the circle you can see that some of the horizontal pieces are much thinner than others so I'm getting inconsistent thicknesses. Anyone got an ideas on what I can tweak to get these printing right? Many thanks Matt
  7. The same just happened to me :( I've raised a support ticket to see if a new part can be sent out. Did support send you a replacement? Matt
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