After researching this answer to Why don’t 3D printer heads use ceramic inner walls? I found an interesting little video for an hotend upgrade – which, despite the name, uses PTFE lining…
Set 4 would seem to be the set to purchase. The differences between sets 1 and 2 and sets 3 and 4 are merely the additional buck-booster from 12 V to 24 V.
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