[Axles fell out, drive belts came off]

Instead of popping the axle out a second time it's easier to just loosen the set screws on a few pulleys, let the tension even out and position the head properly and then retighten.  FYI there are belt tighteners *inside* the side blocks.

 

Ah, I didn't think of loosening the pulley again and letting it slip around instead of manually moving the belt by 2 teeth. That sounds like it would have worked.

Anyway, I just got a basically flawless large print out of this over the weekend, so I think it's fixed for now.

Thanks both for your help. I'll bookmark the X-Y axis instructions for future use.

[Axles fell out, drive belts came off]

We've just tried a repair: undid the set screw on the *left-hand* set of pulleys on the rear axle and moved them to what looked like the correct position (with the rear axle back in place), then tightened both sets of pulleys on the rear axle.  The metal rod holding the nozzle just snapped back into the black plastic block in with a bit of force.  Moving the printer head to the edge showed we'd skipped 2 belt teeth on one side (the teeth appear to be 2mm each), so we took the rear axle back out again so one of the front-to-back belts was loose, checked and put it back.

The "nozzle grinding on the top of the print" I mentioned at the beginning was probably because the rod supporting the nozzle had fallen out of its holder at some point.

I just did a first layer, looks pretty good.

[edit] Some of it didn't adhere because I got greasy fingerprints on the build plate glass during repair. Cleaned it and now looking good (on 2nd layer)

[Axles fell out, drive belts came off]

So...  I try to push the axle at the back into the right-hand hole where it fell out, but it actively springs back to the left and comes out again!  I think it's being held in place by the very tight band joining it to the stepper motor at the rear left corner.

[edit]  It looks like the pulleys on the rear axle are spaced wrongly.  If I put the axle in the right place, the long band on the *left* side is now not aligned (at the rear, it's too far to the right).  Similarly, putting the axle back in place makes the short band from the rear left stepper motor rub against the pulley for the left-side axle there. (My 2nd photo shows this area)

So in summary the pair of pulleys on the left of the rear axle are too far to the right.  I guess I need to unscrew them and move them to the right place?  This would be a bit easier if I could get the whole rear axle out of the machine.

[Axles fell out, drive belts came off]

I put the serial number into the Ultimaker "get support" link at the bottom of the front page of their site and it directed me to get support from fbrc8, so I'm just e-mailing them with all this info.  I think the other company was probably just a reseller.

[update] They replied quickly and said I'm fine to repair it myself.

[Axles fell out, drive belts came off]

Nope.  But you'll be fine.  Just be gentle - this is easy stuff.  

OK, it's very useful information in any case, I might just hold off until the status of the warranty is clarified, which brings me to...

 

Who did you buy it from?  printedSolid/dynamism/fbrc8 all have great service.  They would rather you fixed it yourself than have to have it shipped back and forth (where it will likely get damaged further by the elephants that work for shipping companies).

Well, I might have to have words with our purchasing department because I put in a requisition to buy it from "Dynamism, Inc.", who I know to be an official reseller and I'd used them before. But they bought it from "Ideal System Solutions, Inc." (idealssi.com) instead and I don't know why (unless it was to buy it for 2950 instead of 2999 USD). That company doesn't appear to be on the list of recommended Ultimaker resellers. I'm currently waiting for an e-mail back from their sales/support person, so will wait until I get that before proceeding. I agree shipping it around isn't the best.

[Axles fell out, drive belts came off]

Thanks for your quick reply

I was reading up on the warranty information and it says it's void if I try to repair unless it's "official" ultimaker support advice somehow. I see you're a moderator on this forum - does that mean I can follow your advice and not void my warranty?

[Axles fell out, drive belts came off]

Got an Ultimaker 2 Extended+ just a week ago and this happened:

So the axle at the rear of the machine has gone to the left, sticks out at the left and has fallen out at the right. This made the belt on the right side of the machine loose. Additionally, the front-to-back axle that holds the print head is come out of the black plastic holder on the belt at the back. (The design of this holder looks a bit weird to me since the metal axle is not fully enclosed by the plastic, seems like it could "pop out" easily and this is what happened).

This was during a multi-hour print with a fairly high fill density.  Smaller prints had come out fine

The only odd thing I'd noticed up until it fell apart was that the nozzle seemed to scrape, vibrate or drag a bit as it was making fast moves across the top of the print.  It has left lines on the top of the print where there are moves before.  I don't know what could cause this - naively I'd say the "nozzle was too low" but the top of the print is dictated by where nozzle is putting plastic and the build plate level seems fine too.