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Groove in PTFE coupler


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Posted · Groove in PTFE coupler

Dear all,

today finally I got some time and wanted to install my Olsson block.

Unfortunately I could not remove the temperature sensor, it broke, so I have to order a new one.

Anyway, since I unmounted the original heater block I took this opportunity and examined the PTFE-coupler.

Inside at the bottom end I can see a groove. See left part of the attached image:


The groove is not everywhere. It is distributed on I guess 60% of the inner diameter.

40% are flat without any groove. See right part of the attached image.

My questions now:

1. What is the reason for this groove?

2. Should I replace the coupler?

3. If I don't replace the coupler, what consequences it has e.g. for printing, print result?

Thanks for any help!

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    Posted · Groove in PTFE coupler

    1. Softening of the material because of heat + pressure from the spring causes it to deform.

    2. If you're not experiencing any trouble with printing, no. Otherwise, yes.

    3. The major issue you'll see is underextrusion.

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