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BuildTak adhension plate AND 3Dlac?

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We are trying to print with PC. We need a material that can operate in high temperatures.With our prints we encouter a lot of warping. A little is no problme for out use, but less is better and sometimes it completely comes lose and that we can start all over again. 
We have an adhension plate from BuildTak and we have this spray from 3DLac. We tried using both but still our print failed. Can using both be the problem or is the problem in other settings (nozzle distance/heat/flow etc)?

 

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@Gigi has been successful.  The things he suggest will help you a lot: extra thin layer of PVA (I think that is the main ingredient of 3DLac but not sure).  Cover the front and top of the machine.  brim.  And most importantly overlooked - squish the material a bit more.  Which printer do you have?  On UM printers I like to squish the material a bit more if it's warping.  More info here:

 

 

Also note that there are many other high temp materials.  How high do you need?  This graph in the link below is not an accurate guide - most especially the working temperature of materials (your most important requirement) but if you can pick a material a little more to the left in the lower graph then that will be easier to print:

http://gr5.org/mat/

 

(second graph!)

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