I give out free nozzle cleaning needles to anyone who orders anything on my store. For first time customers. Or customers who request the tool. They only cost me about 10 cents each but are worth so much more when you want to clean a clog in a hurry. thegr5store.com
Anyway usually dynamism has good customer support. @remy ? Also fbrc8.com might have some cores for sale.
PVA is much harder to print than PLA. It doesn't stick to itself so well and it doesn't behave as well. Melted PLA behaves similar to molten liquid glass in that it sticks to itself very well. Like honey but even better. Melted PVA behaves more like mortar (the stuff between bricks) in that it doesn't stick to itself very well until it hardens.
PVA also does not stick well on top of PLA so well. It works but barely. PVA works so much better with Nylon.
Dynamism is generally really great with their support support responses. I'm surpised to hear they haven't been responsive.
It sounds like you may have PVA burnt into the end of your nozzle tip, creating a bockage. The best way I've seen for cleaning out PVA burnt into the nozzle is to do a cold and hot pulls described on Ultimaker's website, but to also use a needle (a 29 gage syringe from the pharmacy works well), to insert into the bottom of the nozzle while it's hot.
Insert the needle into the nozzle tip from the bottom while the nozzle is hot, and then do the hot and cold pulls described here: https://ultimaker.com/en/resources/23132-maintaining-the-bb-print-core I realize this is probably the same page Dynamism was directing you to, but the needle really does make a big difference.
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