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TAZ modular bed... metal plate sags.

Posted: Sun Dec 24, 2017 4:54 pm
by kcchen_00
For those considering the modular bed for the TAZ, the steel plate sags... There's a noticeable 1/16" gap at the mid point of each side.
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I've started using binder clips (the smallest you can find) on each side to keep the glass and metal plate together.
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I guess its not a show stopper... but really? Customers are guinea pigs. The binder clips are probably a weight savings to a thicker metal plate.

Re: TAZ modular bed... metal plate sags.

Posted: Tue Dec 26, 2017 1:14 pm
by Orias
Would you mind taking another picture from the side? Is this on all 4 sides?

Re: TAZ modular bed... metal plate sags.

Posted: Tue Dec 26, 2017 4:47 pm
by kcchen_00
Unfortunately, I can't get to the other sides of the printer to take pictures. But I assure you the gaps can be felt. All it takes is installing and letting it rest at room temp.

Are you confirming that this is not happening on the test product at the AO offices?

Re: TAZ modular bed... metal plate sags.

Posted: Wed Dec 27, 2017 10:57 am
by Orias
How does it behave when heated? In our tests the heater presses up against the glass when heated. The heater portion of the modular bed system acts like a bimetallic strip and moves up when heated to contact the borosilicate glass plate due to the different expansion rates.
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Edit: Add images

Re: TAZ modular bed... metal plate sags.

Posted: Wed Dec 27, 2017 4:07 pm
by kcchen_00
There's much more deformation in my plate. Its not close to touching the glass plate, definitely not the 1mm or .5mm in your pictures. I'm experiencing a 2-3mm gap at room temperature, most likely not to be recovered when heated...

I've put at least 4+hours of printing on the modular bed between installation and finding the gap. Could it be from fatigue?

I'll do a few more tests... but what you're saying is that the sag in the metal plate is normal?

Re: TAZ modular bed... metal plate sags.

Posted: Wed Dec 27, 2017 4:15 pm
by Orias
Things should look nice and tight at the typical printing temperatures. The first picture block shows the bed & heater at room temp at the top, and heated at the bottom. Heat up the bed when you can to verify, and reach out to the support team at LulzBot.com/Support for help. Your modular heated bed has a 30 day warranty and support period, our team is here to help address any questions or concerns.

Re: TAZ modular bed... metal plate sags.

Posted: Wed Dec 27, 2017 9:48 pm
by kcchen_00
I'll check when I get a break in prints. The binder clips don't bother me... except the one near the bed wires which has chance of being hit by the nozzle.

It would help if the gap between bed and metal plate were mentioned on the product page or bed installation (it very well could be mentioned there, as I didn't check OHAI). It just seems like the lack of QC on final products.

Re: TAZ modular bed... metal plate sags.

Posted: Tue Mar 06, 2018 6:19 am
by Farris
Did you ever get a resolution to the plate sag? I just installed a modular bed and am seeing the same sag at temperature. Binder clips "work" but a real fix would be better.

Re: TAZ modular bed... metal plate sags.

Posted: Tue Mar 06, 2018 9:25 pm
by kcchen_00
Nope... Binder clips haven't been removed.

Apparently this is how the modular system is designed...

Re: TAZ modular bed... metal plate sags.

Posted: Wed Mar 14, 2018 5:33 pm
by AllenBW
ditto to this issue, on a taz5 so there's plenty of room for sag worried its affecting the bed temp being inaccurately reported :shock: (says 60 but since sensor is embedded with element... is actually far less)