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Prints well in the front but not in the back of the printer

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Posted · Prints well in the front but not in the back of the printer

Latest firmware is installed some months ago.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

I have been having similar problem, in my case the problem seemed to be in the rear left quadrant.

To the front and right the brim option would produce a nice flat sheet but left and rear it would inevitably be stringy. The problem persisted through several bed levelling's and completely baffled me - the bed seemed to be different temperatures in different areas. This was confirmed by a crude and unscientific touch test - I don't have a thermometer that would help me with this.

I put a feeler gauge between the glass plate and the aluminium bed and this revealed the following:

 

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Posted · Prints well in the front but not in the back of the printer

printbed test

Sorry - I have apparently hit the wrong button ! ?

Front: no gap

Left: 0.7mm

Right: 0.2mm

Back: 0.2mm

It seems the aluminium sheet has warped (I assume the glass has remained flat).

I have for some time been dragging items to the front of buildplate in Cura as a matter of course in order to minimise the effect but unfortunately the problem seems to be getting worse.

See photo.

printbed test

 

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Posted · Prints well in the front but not in the back of the printer

I now realise why i never saw this problem before : Its the first time i make such a big flat object.

All previous things where quickly going up and only had a small surface touching the glass.

IMG 2411

 

Marc

 

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Posted · Prints well in the front but not in the back of the printer

Just be aware that there is a small possibility that it is not the glass/bed but rather the gantry - those 2 thin rods for example or the 4 rods. Make sure those are very straight also. You might want to remove the 2 thin rods (4mm I think) and roll them on a flat surface.

The shipping companies that ship these printers is very violent with the printers.

 

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Posted · Prints well in the front but not in the back of the printer

I would say that if the rods were the problem i could not have made the objects i made so far.

I will check them anyway.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

Hi,

My housing is perfect, I cannot see any problems at all at that level.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

How to take out those rods. Is there some kind of manual for that ?

Marc

 

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Posted · Prints well in the front but not in the back of the printer

I guess it's possible it's one of the 4 larger rods but very unlikely as they are much stronger.

The 2 smaller diameter rods pop out of the sliding blocks and then you can just slide them out of the print head.

For the long rods:

The 4 belts go around aluminum pulleys. Each pulley has a single set-screw (aka grub screw) that holds the pulley to the rod. Loosen those with a 2mm hex wrench and everything slides apart. Keep track of the order of pieces.

There is an assembly manual for the UM2 so you can sort of read it backwards?

ultimaker2 assembly manual - click "raw" to download the pdf:

https://github.com/Ultimaker/Ultimaker2/blob/master/um2%20assembly%20manual%20V1.1%20_english.pdf

 

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Posted · Prints well in the front but not in the back of the printer

You guys were right ! The rod for the x-movement has a very slight exenctricity.

Going to order a new one.

Thanks for the help.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

exenctricity.

You mean it's bent? It's not straight.

 

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Posted · Prints well in the front but not in the back of the printer

yes, a very little bit, but enough to provoke these symptoms i guess.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

As usual no answer on my emails to buy a new rod. :sad:

If i had known this before ...

Marc

 

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Posted · Prints well in the front but not in the back of the printer

Hi Marc,

What is your ticketID?

I can look into it and make sure you get a speedy reply.

Thank you!

 

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Posted · Prints well in the front but not in the back of the printer

Hi Sander,

I dont have a ticket ID.

I sent a mail to sales@ultimaker.com and a mail to support@ultimaker.com.

If you want i can make a ticket if that would speed things up.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

Well it's time to start a ticket then at:

support.ultimaker.com

What country are you in Suminvent? Please update your profile settings to indicate your country in the location field.

Did you test the glass also to see if it is also flat within .1mm or so? (the thickness of a piece of paper).

 

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Posted · Prints well in the front but not in the back of the printer

Ticket ID #RAN-146-84868

I'll recheck the glass to be 100% sure.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

The rod did not arrive yet ! :???:

No answers on my email either for tracking number...

 

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Posted · Prints well in the front but not in the back of the printer

So i finally could do some tests.

With the new rod, it is better, but not solved.

So i did the following: I took off the glass plate and used pronterface to test the surface smoothness, and as expected, in the right back corner, i cannot move the paper under the nozzle, where i can in the other corners.

So my conclusion is that the xyz table is not perfectly horizontal.

Ultimaker could have easily solved this by also using two screws in the back of the table instead of one.

They presume the table is completely horizontal, but it isn't.

No idea how to solve this.

I think i'll have to take this printer apart and reassemble that part.

Marc

 

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Posted · Prints well in the front but not in the back of the printer

Fortunately it is designed to be taken apart easily.

 

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Posted · Prints well in the front but not in the back of the printer

I can't get the protection cover off (Dibond Plate).

Anyone had done this before and knows the trick ?

Marc

 

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Posted · Prints well in the front but not in the back of the printer

You can completely remove the bed without taking off any dibond. You will have to remove the delrin caps underneath the vertical rods on the bottom to get the vertical rods out. But you should remove the heated bed cable first.

 

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