The "old" PVA problem

[Jonas98 19]

Is someone sucesfull and consistend printing PVA with the Ultimaker S5 Bundle?

I got Problems every print I do with this.

Now im using Brekaway whenever ist is possible, but sometimes I need PVA. (And of course I bought the Material station etc because of the "good" handling for PVA)

Some times the PVA broke, and stook in the material station (see Picture), other times the PVA broke at the extruder and the printer says "extrusion problem".

Other time the PVA was stook in the tube to the PrintCore.

Are there solutions or experience with this ?

 

Of course im using original Filament and the Spool is always in the material station

 

Edited November 25, 2020 by Jonas98

[wibraun 0]

I have a similar problem.

I use a brandnew ultimaker S3 an the delivered PVA Material.

Somtimes it is printing fine. But a print in few minutes later the unchanged material PVA brakes mainly in the tube.

I think this type of Ultimaker material is not the best. How ever it is not weth it is try.

But it contans some points of weak material where it brakes. It is a mess.

on the other hand it prints sometimes for houres.

[gr5 2,170]

I've never had this problem but I've only gone through about 3 spools of PVA over the years.

 

I've been told that dry PVA gets brittle and can break.  It might be that your spool is over a year old but I have 1 year old pva that is still fine.

 

Anyway I would first assume that only the outer meter or two is brittle.  So I would try breaking it manually and then unspool a bit and repeat the experiment for a meter or two (and throw all that away) and see if it gets better.  If not loosing the spool a bit so air can get down into the top 2 or so layers of the spool and leave it out at 50% humidity for 24 hours to see if it can self repair.

 

Normally the problem is the opposite - it gets too much humidity.  Then when printing, the water is boiling and causing the PVA to foam and act badly (doesn't stick to itself and it's too big and the head can bump into it).

[Jonas98 19]

On 11/22/2020 at 12:40 PM, wibraun said:

I have a similar problem.

I use a brandnew ultimaker S3 an the delivered PVA Material.

Somtimes it is printing fine. But a print in few minutes later the unchanged material PVA brakes mainly in the tube.

I think this type of Ultimaker material is not the best. How ever it is not weth it is try.

But it contans some points of weak material where it brakes. It is a mess.

on the other hand it prints sometimes for houres.

I had this problem bevore. I changed the bowden tube to the PrintCore to a PTFE tube.

After this the prints worked.

But then I dont used it for 2 monts and had the problems again.

 

On 11/22/2020 at 3:47 PM, gr5 said:

I've never had this problem but I've only gone through about 3 spools of PVA over the years.

 

I've been told that dry PVA gets brittle and can break.  It might be that your spool is over a year old but I have 1 year old pva that is still fine.

 

Anyway I would first assume that only the outer meter or two is brittle.  So I would try breaking it manually and then unspool a bit and repeat the experiment for a meter or two (and throw all that away) and see if it gets better.  If not loosing the spool a bit so air can get down into the top 2 or so layers of the spool and leave it out at 50% humidity for 24 hours to see if it can self repair.

 

Normally the problem is the opposite - it gets too much humidity.  Then when printing, the water is boiling and causing the PVA to foam and act badly (doesn't stick to itself and it's too big and the head can bump into it).

 

The material is brittle... So I its to dry 🤔?

 

 

[gr5 2,170]

I don't know.  99% of the time, PVA and Nylon get too wet (not too dry) but I've heard (from @SandervG ) that it can get too dry and one of the symptoms is that it is brittle (I've never experienced this and I basically drown my PVA in desiccant).  I don't think Nylon is a problem when it's too dry - just PVA.

 

I have multiple humidifiers running in the winter so it never gets below 40% humidity in my home.

[SensataPDS 1]

Watch your retraction distance and speed on this material it can quick become worn, i really liked this material for support but have been forced to move to breakaway support due to the same issues as everyone else.