Burning

[mckinnonk]

I just installed a swiss micro all metal hot end, and I'm having issues.

I usually print PETG at 240c, but after the hot end change I had to bump it up to 250c. I also turned off retraction, as it was goobering too much.

This is my first print with this hot end, and I don't know why it's all burnt. What setting to change?

[jfkansas]

PETG hates to be over extruded. When it overextrudes even a little some plastic accumulates on the outside of the nozzle and cooks to a brown gunk. This will eventually deposit a stain onto the printed piece.

In short, turn down the extrusion multiplier about 10% to start. So if you are at 1.00 change to .9 or so and see what happens.

[mckinnonk]

I'm at .9 multiplier, I will try .8 tonight.

Thanks, for the suggestion.

[horst.w]

... then take first an exact messure of the diameter of your filament, preferably with a micrometer-screw. The value is to be fit in menue Others.

The range of the multiplier from 0.9 up to 1.0 or more is only the fine tuning of the diameter.

Regards
horst.w, GER

[mckinnonk]

Unfortunately, that did not work. 0.8 didn't fix it, and the filament is 1.75

Update:
I found out I did not have the hot end tightened all the way and it was leaking filament from the top.