Adrian posted a new plan for a g
eared extruder nozzle withPTFE lined PEEK thermal insulation and brass nozzle a couple of days ago. This looks easier to make since it doesn't involve tapping threads. I'm wondering if the PEEK over brass joint would be prone to leaks since the plastic would expand at high temperature. The PTFE tubing would expand inside the brass so perhaps that's enough to seal the joint.