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Extruder getting off course

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Posted · Extruder getting off course

Hi,

I got my Ultimaker 2 in Janurary, and have been getting good quality prints for the past 4 months.

I am attending a trade show this weekend, and was invited to bring my 3d printer, so in anticipation, I have printed about 10 objects for example.

Suddenly, starting yesterday, I have been having a problem where the extruder is printing just fine, and then suddenly I hear a kind of grind sound, like the belt is slipping, and the whole nozzle and everything moves to the right about 10mm. And it keeps printing like nothing happened. I have attached a photo. I was printing a vase that should be straight up.

I did buy some sewing machine oil and did oil the x and y shafts, but its still bad.

Any help for this newbie before my show on Friday????

 

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Posted · Extruder getting off course

95% of the time it's a loose set screw on the pulleys. Especially when it's a large sudden move like this. So get a 2mm hex allen wrench and tighten the hell out of the axis that is slipping. It's 70% of the time the one on the motor itself so you may have to remove the cover over the motor which only has 2 screws holding it in. You may have to also separate the motor from the wall which is another 4 screws - position the bed just under the motor so you can rest it on the bed if you need to take a quick break.

occasoinally it's the other pulley on the short belt. Very rarely it's one of the other 3 or 4 pulleys for that axis.

 

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Posted · Extruder getting off course

So I tightened all the screws, including the screws on the motor. But it's still happening.

Happens within only 3-4 layers before it screws up.

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Posted · Extruder getting off course

Any help?

I printed an octopus twice and both prints had issues at the same layer.

So I tried a shorter model. Printed the whole thing, but I had Cura set to do two models. First model went well, but the second failed in 2-3 layers.

I have no idea why.

Ideas?

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