Here's the tube from inside my J-Head:
and here's inside the bit that points into the hot end:

I'm guessing it looks a little on the rough side. Any suggestions as to what kind of abuse would cause this?

Thanks,
Phil

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Mendel iteration 2
J-Head Mk4 (0.5mm & 0.4mm) 3mm sleeve
That head from eBay from Poland (0.3mm)
Wade, Wade's accessible

Update - this was possibly started when a small ball of metal got stuck in the nozzle!

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Mendel iteration 2
J-Head Mk4 (0.5mm & 0.4mm) 3mm sleeve
That head from eBay from Poland (0.3mm)
Wade, Wade's accessible

Glad you are back up.

see thread on same issue:
[forums.reprap.org]