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I'm having some warping issues on larger petg prints. A nice sized brim fixes it 50% of the time. Some times, the brim can't hold it down and it tears. Other slicers have an option to have the brim print for the first 2 layers. Can someone add this to the feature request list. 2 layers are still easy too cut off, but helps pin it too the bed. If there is a work around or plugin though, that would be great.

Thanks 

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Well you can make the bottom layer thicker - there's a "bottom layer thickness".  

 

I've never had this problem with petg.  My problem with petg is it sticks too well.  So well that it lifts pieces of the glass off and I get glass shards in the bottom of my petg prints.  I use a very very thin layer of PVA (I like to mix wood glue and water but there are other ways to do this).  Also stick your petg in hot water and see where it softens and make sure the bed is above this temp.  This will allow the bottom layer to warp just the tiniest bit (< 0.1mm) and spread the load (relieve the strongest stresses).

 

Another thing is you want to make sure you are squishing that bottom layer.  The more the squish, the better it sticks.

 

But seriously, If I were to print the UM robot with petg, you can pick up the whole printer with the tiny robot and spin the printer around.  It won't come off.  The glass will shatter first.

 

 

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you could also use some strong tape like duct tape over the brim when it is done printing in the places where it is prone to warping. Don't push to hard while taping because the bed will move down a little.

It can help sometimes (not always unfortunately) to prevent the first lifting, as long as the brim stays in contact with the glass, it works. When it starts to lift it can pull it further and cannot be stopped . 

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On 3/29/2018 at 3:42 AM, peggyb said:

When it starts to lift it can pull it further and cannot be stopped . 

Yes - once air gets under there it's pretty hard to recreate that vacuum seal.

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