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Significant glass delamination started occurring in last month


CTotten
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Posted · Significant glass delamination started occurring in last month

I have been using an S5 for about 2.5 years now (using two S5 Pro Bundles for the last year).  Since I got the first S5, I have been using basically the same glass print bed for all our prints.  Our original S5 has about 6000 operating hours on it, and our newer S5 has about 2000 hours on it, so they have been used quite a bit.  Overall all of that time, I have had a couple of small glass delaminations occur, but we were basically still using the original glass beds.

I started using Vision Miner's Nano-Polymer Adhesive about a year ago, because it held both the CPE that we print 95% of our jobs with, as well as BreakAway.  I haven't had any issues with it, except that it holds the BreakAway really well, meaning I have some scraping to do between prints.  In most cases, the CPE only prints just pop off after they cool down.

 

Anyway, about a month ago, I came into work and found that both machines with finished prints, but when I removed them, significant portions of the glass delaminated with the print.  I thought it was odd, but the glass was old and had a few chips in it, so I thought it just finally gave out.  So I pulled out the brand new spares.  The few days later, the same thing happened with brand new glass.

- I reperformed the manual leveling on both machines, thinking maybe it was a thermal issue with colder weather causing the first layer to print too close. 

- I also switched over to using the UHU stic provided from UM on the CPE only prints.  We got 4 new pieces of glass from our distributor, and got back to work. 

 

Today, I come into work and find both prints again caused significant delamination.  One print is about 8" x 8" square with a solid bottom layer.  The other is a 8" diameter circle, with about 50% of it being a solid bottom layer (with some openings).  So they are both "large" prints with solid bases.  But I have literally printed hundreds of items like this without an issue.

 

I am running 6.5.1 on both units, and have not updated firmware in about 2 months.

 

Any ideas on the causes of this?  I have shreaded 5 sheets of glass (at about $45 each) over the last month, after not losing a single one over 2.5 years.  I am printing the same things, with the same materials, using the same techniques that I have been using for a long period of time.  But something seems to have changed.

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    Posted · Significant glass delamination started occurring in last month

    This is quite odd - for me - in that I have been printing on my UM3 for several years (about 4 - maybe 5? time flies) - and I just this week started seeing this.

     

    I have printed maybe 90% PLA over this time, I have printed only one full spool of CPE about 2 years ago. I have printed maybe a half spool of ABS and about three weeks ago started printing PETG for the first time. After my 2nd full spool of PETG, I got significant glass delamination (tagging for searchers: glass peeling, cracking, chipping, separating)

     

    I use hairspray exclusively and always have. I have finished my PETG project for now and an currently printing PLA again. I offer you no help, only solidarity. Hopefully someone picks up on his thread and offers a cause / solution. (It is the cause that has e baffled.)

     

     

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    Posted · Significant glass delamination started occurring in last month

    I also have this problem. However, I only know it with printers that are in the cold. If the objects are large and higher than one cm.


    Therefore I had explained it in such a way. The object cools down faster in the cold and contracts against the thermal expansion. The contraction varies depending on the material. And the greater the temperature difference, the greater the effect.


    In addition, there is a kind of leverage effect at cold temperatures. Because the object does not cool down evenly, but in the upper area first. The residual heat of the plate and, in particular, the lack of air circulation between the plate and the object prevent uniform cooling. As a result, the surface of the print object cools down and contracts. The edges are torn from the plate and the walls and structures of the object act as levers.

    Because the plate is still warm at the time and there is good object adhesion, it cracks.


    At warmer temperatures, the effect is diminished. Even if you take the plate out of the printer immediately after printing, or even put it in the refrigerator, the effect is not as strong.

     

     

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