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PVA not sticking evenly to printing bed and on layers

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Hi,

 

Does anyone have tips for better printing with PVA as support material?

The PVA seems to stick unevenly on my printing bed and on top of other layers.

Most of the times is goes well, but sometimes a complete loose web of PVA is floating through my printer when checking my print after a few hours.

Should i increase, decrease the flow (currently 105%) of PVA or disable retraction ? Something else to improve the printing of pva?

 

 

Cheers,

Peter

 

IMG_4923.JPG

IMG_4922.JPG

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No does not pop, smoke or sizzle. When feeding it drops down straight and does not curl. No dark spots in the PVA indicating that moisture is the issue.

Printer is in a closed environment with multiple moisture absorbing bags.

 

It does stick badly to PLA but as can seen on the photos worse on the bed itself.

So, sticks badly everywhere. 

 

Clean the build plate using ammonia and a drop of water. Rub it with cleaning paper till i feel some resistance.

Works perfect for all materials o use. Only now and then PVA gives me headaches. Because PVA does sometimes stops sticking on other PVA layers is do suspect the feeding or retraction settings...

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