I would definitely get a spare PTFE Coupler as these wear out after a few 100 hours of printing - especially if you print above 230°C. Or better get yourself an http://3dsolex.com/?page_id=2 with and http://3dsolex.com/?page_id=17 that protects the PTFE coupler from the heat of the nozzle. That way you have a longer lasting PTFE coupler and the added benefit of cheap M6 thread nozzles with varying diameters.
Personally I have experinced 4-500 hours from a Teflon coupler, but that since I mainly use PLA, with just the occasional XT or ABS
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apicalreform 1
Thank you reibuehl. It was very useful.
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