Ultimaker's pva problem

[BogdanG312 0]

Hello, I bought my UM3 around a year ago. For the last 2-3 months a am facing the same problem over and over again.

At the beginning everything was perfect. But as  i said around 2-3 months ago the PVA(I use the ultimaker's one in BB core and PLA in core AA). It's like the PVA isn't sticking to the PLA.

Is there any fix or?

 

Best regards,

Bogdan

 

[Smithy 1,146]

Could be that your PVA is not dry enough. PVA is very hygroscopic and needs a dry storage, always!

There were a lot of similar issues the last days/weeks, search the forum for specific actions, like how to dry your PVA.

 

If humidity is high in your area, also think about a dry box or something like that, because a dry PVA could get too wet during a long print quickly.

[ultiarjan 1,223]

In my area (the Netherlands) it's enough to keep the filament in a container, without extra active drying. I've used PVA of over a year old (Ultimaker and other brand) without any issue. Prevention works. In other climates you may need active drying, not sure, but anyhow prevention pays of. 

 

My simple DIY box, I also print from the box...

https://www.youmagine.com/designs/drybox-for-pva-ultimaker3

[BogdanG312 0]

Thanks all for the fast answers i will try the dry box. But i am really surprised because i opened this PVA around 10hours ago.(It was brand new).

Again thanks all,have a nice day ?

 

[JohnInOttawa 104]

FWIW I no longer use any support strategy where PVA rests atop PLA.  Everything has to touch the build plate or I use a different support material.  Just too many problems.  In my case, I put the PVA in a dryer before and after every use, never hear sizzling or popping so I am pretty sure it's all dry.  I think it's just a finicky material and the BB core takes careful management to avoid clogs. 

 

I'm sure others have a better technique.  Perhaps breakaway would be a better option, but I haven't picked any up yet.

John

[Smithy 1,146]

1 hour ago, BogdanG312 said:

But i am really surprised because i opened this PVA around 10hours ago.(It was brand new).

 Was just an idea, maybe it is ok and you just have the problem that PVA will really not stick to PLA.

 

53 minutes ago, JohnInOttawa said:

Perhaps breakaway would be a better option, but I haven't picked any up yet.

 

Breakaway is ok, comes out nice and not much post cleanup needed, but for most support prints I use PLA if there are not specific requirements or needs.

[JohnInOttawa 104]

Thanks!  While we're on the subject, I have a nylon print coming up later today, support would be good but my last PVA attempt at that wasn't great.   Have you tried PLA as a support with Nylon? 

 

John

[ultiarjan 1,223]

I used Ultimaker Nylon with PVA, think Nylon is one of the best materials to use with PVA, it sticks much better to it than PLA.

 

And no, did not try to use PLA as support, think you should give PVA another try....

[Brulti 177]

Same here than Ultiarjan: I successfully used Nylon with PVA many times.