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Current version by: Tsung-Hsiang Hsueh

Text:

Hi, without more details on the actual print, I cannot be certain, but I think you must be experiencing color bleeding. Sometimes, there is a little left of the previous filament in the hotend and that may appear several layers later. This can happen if the inside of the hotend is not 100% smooth and/or it is not equally hot across the entire cavity. For example, if a cooling fan is blowing on one side, some filament may get stuck on that side. Eventually it may dislodge (I have seen it happen even after several days of prints) and it may happen more often when mixing filaments of different types or manufacturers which may have different melting temperature ranges. One way to reduce is to play with the advanced transition length settings. For example, going from more “recalcitrant” filaments you need longer distances to purge it completely than the other way around. Same applies for going from stronger colors to weaker colors. It takes a lot more of a light color to purge a darker color, because even a tiny bit of the darker color will show through.
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+One more thing to check is if you are using bowden, make sure there is no gap in the neck to tube junction. That is a common place for molten filament to hide.

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open

Original post by: Tsung-Hsiang Hsueh

Text:

Hi, without more details on the actual print, I cannot be certain, but I think you must be experiencing color bleeding. Sometimes, there is a little left of the previous filament in the hotend and that may appear several layers later. This can happen if the inside of the hotend is not 100% smooth and/or it is not equally hot across the entire cavity. For example, if a cooling fan is blowing on one side, some filament may get stuck on that side. Eventually it may dislodge (I have seen it happen even after several days of prints) and it may happen more often when mixing filaments of different types or manufacturers which may have different melting temperature ranges. One way to reduce is to play with the advanced transition length settings. For example, going from more “recalcitrant” filaments you need longer distances to purge it completely than the other way around. Same applies for going from stronger colors to weaker colors. It takes a lot more of a light color to purge a darker color, because even a tiny bit of the darker color will show through.

Status:

open

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