Thanks Zen and Julia. You are confirming that I'm not out in left field standing under a piano. (uh, can you spell mixed metaphor?
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Since I installed my ZT HE I have printed a fair amount of both Z-ABS and UltraT, letting Zortrax set the temps. So far I haven't noticed any changes in performance, burnt stuff in the print, etc. Also, I tried printing UltraT at 240℃ and Z-ABS at 255℃ and both seemed to work. But sometimes it's quiet.... too quiet.... so I thought I'd ask.
From what you've said it sounds like my PTFE tube is probably crispy already. However, since that doesn't seem to be hurting anything and I can probably print Z-ABS even lower, I think I'll let sleeping hotends lie (there I go again) and start my Z-ABS task at about 245℃. If anyone cares, I'll let you know how that goes.
Tnx again,
Jeff