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PVA support not printing correctly

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Posted · PVA support not printing correctly

I'm using an UM 3 extended and I'm having problems with PVA. I found the material in my institution and I think it was not properly stored. It has been in a room for months, not in a sealed bag. I did a hot and cold pull to clean the print core. I noticed grinding, so I cut off the last part of the material.

When I print with PVA as support material sometimes it does not come out at all, other times it is not uniform, as in the pictures below.

Is this a problem with PVA? Can I do something to make the PVA usable again?

Thanks in advance.

 

20181015_121538.thumb.jpg.b789dc78550e908f539fdbe9b6a9dec6.jpg20181015_155314.thumb.jpg.4701565f2b2da2b525e3b65ab15f0b80.jpg

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Posted · PVA support not printing correctly

To restore PVA: Some people dry in oven at I think 100C but that is terrifying because PVA gets a bit soft at 65C so I would dry it on a heated bed set to 60C with a towel over it and leave it overnight.  I have not had to do this yet.  Maybe 60C isn't hot enough to dry it in merely 12 hours.  Maybe 100C won't destroy your entire spool.  But 60C should be safe.  You can put sample amounts on the bed and leave for 3 minutes under a towel to see what happens.  Starting around 65C it gets very bendable and when it cools back to 60C it's in a new shape.

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Posted · PVA support not printing correctly

Oh and definitely it's absorbed too much water.  It was the first thing I assumed when I saw your photos and before I read the text.

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