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Olsson block nozzle problems

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Having fitted a new nozzle to my Olsson block last week the printer under extruded.

I fitted the original one again and it printed OK.

Suspicious, I have tried to pass 0.3 micro drill through the new nozzle and it will not go.

I believe these spare nozzles (which I bought last June) are 0.25 and not the 0.4 I ordered.

I am going to attempt to drill them out.

Others have posted about under extrusion with the Olsson block and I believe they should check this possibility.

Edited by Guest

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There is one dot on the nozzle.

Since my original post I have found another thread https://ultimaker.com/en/community/8689-custom-heater-block-to-fit-e3d-nozzle-on-ultimaker-2-the-olsson-block page 30 which refers to considerable confusion regarding the nozzle markings and the fact that some wrong sizes were sent out.

I must be the recipient of some of that batch.

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