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PVC Jamming in Feeder - Ultimaker 3 Extended

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Hi,

 

Just wondering if anyone has any advice on this issue? The PVC filament is getting jammed in the feeder, it curls around the wheel and I have had to take the feeder apart to get it out. When it first happened I made sure the nozzle wasn't blocked and cleaned it. I have also un-loaded it and re-loaded it a couple of times.

 

It only happens when a job is running. It will feed fine when i re-load it each time.

 

Thanks!

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Hi and welcome!

 

I assume you mean PVA filament and not PVC?

So in that case your filament has probably absorbed too much moisture and is now to soft. PVA is very sensible for too much moisture, so keep it always is a dry place - Lock & Lock box or bags with silica gel.

 

To rescue your PVA filement you can bake it in the oven to dry it. Not sure right now about the temperature, but as far as I can remember it is round about 50°/60° celsius.

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Here you find all informations about temperature and duration:

https://ultimaker.com/en/resources/52682-how-to-dry-pva

 

The article mentions not to use a household oven, I think the reason is, that such ovens often heat much higher and cannot hold a constant temperature, but there are a lot of people that have successfully used their oven. Just check if before, that you don't overheat your PVA which would result in a "block of plastic" 🙂 

 

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I use a food dryer/dehydrator. The one I have has digital temperature (max 70 degC) and timer (max 8 hours) controls - the timer means you don't have to remember when the PVA will be 'cooked'. It came with stacking trays - I cut out the centre of a couple of trays to give enough height for a filament spool but others have printed riser pieces to get the height.

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So I tried drying the PVA today and the same thing happened when I tried to use it a couple of hours later. Thinking it was just that PVC I tried a brand new one and its doing the same thing. It will feed it in to a certain point and then it stops and starts getting stuck, chipping the PVC and not going anywhere! I'm at a loss now.

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