Print bed sagging in middle
How many people who got Prusa XL with a large sag (>2mm) near the middle of the print bed? I've know at least one more person with this issue.
I have an temporary fix by removing the "Z-Axis Bearing Housing", increasing the bed probing z-hop height to 3mm, and some tweaks with purging before each print. Currently my Prusa XL multi-tool works great when that issue is solved.
RE: Print bed sagging in middle
I just checked mine...received the printer last week. Mine is looking perfectly flat across the entire bed...checked it when cool.
RE: Print bed sagging in middle
I received 8 xl's in the past week, and one of them has a badly sagging/bent heated bed, apparently from being dropped during transit by DHL to Arizona in the USA. The gummy bear container sits in a cardboard carrier inside the shipping box directly above the heated bed. Upon opening the shipping box, I noticed that the gummy bear container had smacked down on the heated bed and broken open, scattering gummy bears all around the inside of the printer.
I have sent over 15 photos of the packing damage, and the damage to the heated bed, and so far, Prusa quality control just keeps asking for more photos, claiming that they don't believe the bed is bent. Any one can look at the photos and see that it is bent, but so far, they have refused to replace the printer, or at least send a replacement bed. I'm very Disappointed in Prusa's response to this after spending close to $30,000 for 8 of these printers.
RE: Print bed sagging in middle
it looks bent to me
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So I just got off a chat wih Customer service, and so far they have not made a decision on whether to replace the printer or repair it... they are indicating they want me to return the printer to them for repair. Not thrilled with having a printer that has been bounced half way around the globe 3 times by the time this gets over, not to mention the time it's going to take. I paid an extra $500 to have a factory assembled printer, and I am not happy with the idea that after all this what I end up with is a repaired printer that may have other damage because it was dropped by DHL. In my book Prusa should step up to the plate and replace this printer with a new one. The measure of a company is how they respond when things go wrong, and in this case, Prusa's response is incredibly poor and a really crummy way to treat a customer who has bought over $50,000 worth of printers from them. I already own 16 other Prusa printers. very disappointed with how Prusa is handling this.
RE: Print bed sagging in middle
Not to detract from your issue (very unfortunate) but is this not an issue that DHL is responsible for? Hope things gets straightened out for you soon,
RE: Print bed sagging in middle
I would think DHL is responsible for it, but they said the shipper has to file the claim, not me, and Prusa is in the process of doing with the photos I have sent to Prusa. I got word from Prusa today that they plan to send me a replacement heated bed.
RE: Print bed sagging in middle
I have the same issue with our assembled 2T XL, also in Arizona. I'll be reaching out to customer service to request a new bed.
RE: Print bed sagging in middle
That is an AWESOME ruler!
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After quite a while of no solution to the sagging heat bed, I've decided to disassemble the entire heat bed to see where the bend is. After taking out all the heat tiles, it became obvious that the bed frame was bent. There is a uniform drop from the sides and reaches a maximum of about 2.4mm at the center of the bed frame.
I've tried to flatten the bed frame by leaving it on a flat surface and putting something heavy (>50kg) on top of it. Unfortunately, the aluminum bed frame is flexible enough that it will bounce back to that 2.4mm sag even after hours of pressed.
Anyone have any suggestions on how to flatten the bed frame?
RE: Print bed sagging in middle
Our issue is exactly the same, and from our best judgement due to the manufacturing process of that part, possibly internal stresses released from an extruded (instead of cast) aluminum stock, or poor workholding when the piece was machined.
I have just received news that my case will be resolved by Prusa via a new bed assembly.
I doubt you will be able to flatten the aluminum without bending the opposite direction, but I would encourage you to follow up with Prusa before you do so, or attempt anything else to flatten the part.
After quite a while of no solution to the sagging heat bed, I've decided to disassemble the entire heat bed to see where the bend is. After taking out all the heat tiles, it became obvious that the bed frame was bent. There is a uniform drop from the sides and reaches a maximum of about 2.4mm at the center of the bed frame.
I've tried to flatten the bed frame by leaving it on a flat surface and putting something heavy (>50kg) on top of it. Unfortunately, the aluminum bed frame is flexible enough that it will bounce back to that 2.4mm sag even after hours of pressed.
Anyone have any suggestions on how to flatten the bed frame?
RE: Print bed sagging in middle
It's hard to believe that these beds are not being replaced if they arrived this way due to shipping or QC or lack of.
RE: Print bed sagging in middle
It looks like (for at least the assembled printers) their QC is a small multicolored Prusa logo. I could see how the issue shown above could be missed due to the fact that the probe operation will only cover the print area being used.
I would hope that their QC procedures are expanded to check the whole printable area, going forward.
Their support resolved it quickly and professionally for us. No complaints there.
It's hard to believe that these beds are not being replaced if they arrived this way due to shipping or QC or lack of.
RE: Print bed sagging in middle
This is the bed frame with the bent in the middle. It might have been a faulty from the factory because the sag is very uniform. More like a bow in the middle slowly rising up to each side.
RE: Print bed sagging in middle
I think I would try to straighten it while waiting for Prusa to replace it. It can't be used anyway. I would build a square frame and use a hydraulic jack placed at the low spot and see if that would straighten it out. I know a machine shop could straighten to very tight tolerances.
RE:
It looks like (for at least the assembled printers) their QC is a small multicolored Prusa logo. I could see how the issue shown above could be missed due to the fact that the probe operation will only cover the print area being used.
I would hope that their QC procedures are expanded to check the whole printable area, going forward.
Their support resolved it quickly and professionally for us. No complaints there.
It's hard to believe that these beds are not being replaced if they arrived this way due to shipping or QC or lack of.
Interesting I am surprised they don't print the sample full bed print that is on the USB they send with the XL. It is a pretty fast print.
RE: Print bed sagging in middle
Ok, so I do not know how these are boxed up. Are the large tubs of Hariboo's packed on top of the bed frame and not only with that weight down on it but in shipping get bounced up and down? Just tossing that out there as I would rather something stupid like than than a huge QC error
RE: Print bed sagging in middle
I made a temporary to permanent fix to the sagging print bed. It's a temporary fix but it was painful so I'm going to leave it as a permanent fix.
Posted it under User Mods
RE: Print bed sagging in middle
I hope that although you said it was a temp/perm fix you do not let Prusa off the hook with this. Myself I would have done the same to print for now but that is not acceptable thing to have to do for such an expensive well touted perfect machine. I hope this gets fixed for EVERYONE by Prusa in the future.