Multi-color print woes. Prime Tower and color bleeding

First off, I am new to 3d printing. My first printer is the P2S + AMS 2 Pro combo that I got on January 20th. I’ve been keeping it busy and slowly building up my familiarity with the device and what to look out for when downloading/printing profiles from MakerWorld.

I’ve been really successful on single color prints or multi-color prints where colors are separated by objects/build plates.

I have recently started trying to get into true multi-color printing and have been running into some issues.

The main issue is the Prime Tower. I’ve tried different models from MakerWorld, each one varying in height, from short 5-10cm to large 15cm+ and the issue is the same on all of them.

After ~200 layers, there seems to be some bulging out the side of the Prime Tower. Reading the documentation in the wiki for Prime Towers, a similar visual appears under the Deepened Start Point Gap for Interface Layer: heading. So is this an issue of Purge Blobs? Do I need to increase the

After the bulging starts, maybe 10-20 layers later, the Prime Tower gets knocked around and then major spaghetti happens and then filament ends are all over the place (think i used that terminology correctly).

This then lead me to testing some suggestions I found under the P2S and H2-series printer topics, recommending that my Flow Rate and Flow Dynamics needed to be calibrated. So, I did both. Flow Dynamics was kind of tricky for me to discern between the absolute best one, but it was between .2 and .3. Flow Rate, my BL PLA Matte was spot on to the defaults and BL PLA Basic was adjusted from .98 to .9981. Filaments were dried before hand, AMS is showing 16% humidity.

I also played around with changing the Z hop mode to Normal incase it was the print head colliding with the tower itself.

I played around with Brim width as well for the tower without success as well.

The secondary issue is that, well i cant quite explain why it is happening though in the example picture, the green that is on the same layer as the black eyes is darker.

It’s quite obvious that you have a problem with the first layer. This could explain why your prime tower isn’t adhering to the plate and is falling over. If the foundation is already poor, it will only get worse later on.

You have to start with the first steps. Why is the first layer bad? Your brims look really bad, that’s not normal.

  • Plate not properly cleaned and still greasy?
  • Has the filament become moistened?
  • Calibrating the flow dynamics of your filament?

Yes, I read that you did that to some extent, but something isn’t right. You should have noticed that something was wrong with the first layer during calibration.

Thank you for pointing that out, I hadn’t actually inspected the brim quality.

I did clean the plate with soapy water and non-abrasive sponge. Filament, according to AMS is 16%. Did the flow dynamics calibration, I can try that again.

I just finished doing a cold pull as well.

Let me see about improving the brim quality.

Will get back

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Well, this is resolved. I cleaned the build plate again with a different soap that didn’t leave residue that the other one was apparently leaving. Prime Tower is no longer popping off the build plate and adhesion overall is back to normal.

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@Schumacher Out of curiosity, what soap wasn’t working? I recently was using Dawn powerwash and learned that that one is no good. Just wondering what didn’t and did work for you.

It was also Dawn Powerwash.

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The green+black bleed issue can be fixed by maxing out (or greatly increasing, your call) the purge volumes.

Find the cells in the table that correspond to your green and your black, and make the “to → green”s number a lot bigger. This will help purge out more black after the color change. Not all filaments are equal in how intense their pigments are, so this is how to adjust to get that amoutn just right. The values in there are based off best-guess with the color hues in the slicer, but reality is often different.

Will give that a shot, thank you. I made the assumption that Bambu Labs dialed that in fairly well.

That did the trick, thank you for that.

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