These biqu H2 extruders are great, but they do tend to Jam, this is how I sort that out when it happens to me. This stops it jamming altogether.

reviews
   • The fantastic* BIQU H2 extruder/hot e...  
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https://3dprintbeginner.com/biqu-h2-e...

ordering
cheapest for uk
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direct
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AliExpress store
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Amazon
https://www.amazon.co.uk/BIQU-Upgrade...