I just multicolored printed for the first time, and the convenience was awesome! However, when I stress tested, the part, it broke much more easily than I had anticipated, right at the color joint. Upon closer inspection, I noticed that the area where the colors meet broke very cleanly. Not much white broke off with the red.
Has anyone also experienced this? What can I do to make the part stronger? I have some ideas but I’m not sure how to do it in the slicer:
Treat the red as a “shell” only. Print only some {shell_perimeters} number of walls in the specified shell color.
“Interlock” the internal walls. I vaguely remember seeing this option in prusaslicer, but can’t find it now. The idea is that internal perimeters would print with offset widths, so that the vertical “seams” would be stronger.
Remove the internal outer perimeters entirely, and print the internals as if it were a single part (since it is!)
Same problem as in so many other topics and Bambu does not provide any meaningful help on their pages, let alone Studio
Let me quickly sum it up:
The layer has a certain amount of time to cool until the nozzle goes over it again.
Be that due to the overall layer time, slowing down for complex areas or colour changes.
Problem is that once too cold the previous layer won’t properly bond to the new one.
Plus it makes the extruded filament cool down faster, resulting in wall differences.
This is particularly painful in cases like yours where you face vertical seams between the parts.
The filament just stops ate the cold previously extruded plastic and pushes the other way - it cools down too fast.
I usually compensate in my models by mating the parts with some more or less hidden dove tail joints.
And I leave no gap as you otherwise would in order to being able to manually assemble the parts.
I prefer this way over what some slicers offer as it allows for best design flexibility and strength once printed.
Oh thats an interesting idea. So do you create 2 parts with a mechanical joint, and import 2 parts together and let the printer print them together? Or you join them by hand?
I might give the first technique a try, it sounds interesting! I hope the cooling expansion won’t be too bad.
I print them like this and the joint does not need perfect angles.
Literally just to increase the contact area and different angles.
Somewhere not visible of course.
For small prints I don’t bother much, but like a hand in a different colour on a larger model would at least get some ‘stick’ going into the arm.
If the layer bond is bad nothing will happen, if it is good I lost a bit of time designing things but either way the model won’t be ruined or needing glue afterwards.
It sounds like the issue might be the adhesion between the different colors. You could try adjusting the temperature settings or checking if the filament types are compatible.
It’s a setting in Bambu Studio on the same settings tab as numbers of walls, etc. I’m not in front of my computer but it may be in the Strength tab? It’s a selection box where you pick “normal” (IIRC) or arachne. Pick arachne and you can then set parameters. Hope I got that right but it’s a setting in the other walls settings.
