On this thread, Does anyone tried Palette 2.0 on Creality Ender 3 or Ender 3 Pro?, there are a couple of useful links:
However, with respect to your question about the flow rate and steps/mm, there isn't much info out there about that, and no one seems to have experienced similar issues, but your issue might have something to do with profiles - which, as you haven't mentioned them in your question, it is hard to know if that might be the issue or not.
In the same thread, this post, states:
I use it with the Ender 3. There is a profile in Canvas and Chroma for it also.
This link here, Chroma for Palette 2, states that after using Cura, you then need to load the G-code file into Chroma v3.1, after having selected the appropriate profile. However, if you use Canvas, then there is no need for Cura nor Chroma, as Canvas can slice. This link goes through the whole process for Benchy.
At the risk of repetition, the process for preparing the print, post-slicing, is also given here, from Multicolor 3D Printing How To: Using the Mosaic Palette+ with the Creality Ender 3, albeit slightly different from the link above:
Setting Up Chroma:
When you load up Chroma, you’ll be presented with a blank canvas ready
to be filled with your 3D creations. In the top left corner, make
sure that you have the Ender 3 selected from the drop down menu.
After this you can click Load Print. From there you’ll be presented
with your gcode files that you have on your computer.
In this example we will be selecting the
butterfly-1.gcode file, and
clicking Open. From here Chroma will be compiling and arranging the
settings for the gcode file to be displayed. This might take a minute
Selecting Your Colors:
Once the loading is completed, you will be presented with the 3D
rendering of our butterfly! This butterfly will be in 4 randomly
selected colors by default, but we will be changing this next! To
change the colors, navigate to the top of the screen where you will
see 4 colored circles, and drop down arrows along with each circle.
These circles represent the colors of each tool head.
To change the color, click on the Tool Head Colored Circle, and your
options for color will appear, we’re going to select Black for our
first color. After this, you will want to select the Default PLA
Settings by clicking the Drop Down Arrow to the right of the first
Tool Head Colored Circle.
As we make these changes you will notice that the 3D rendering of our
butterfly will change to our corresponding colors. Repeat this
process for the remaining 3 Tool Heads, remember to use the Default
PLA Settings for each Tool Head.
Saving Your Project:
After you have selected all your colors, you will click Save for
Printer in the top right corner of Chroma. From there, name your
file, and click Save. You will be then presented with a loading bar
as Chroma prepares our 2 output files. One of the files will be an
adjusted gcode file that has added the purge tower we just modified,
and the other file will be a file that goes straight to the Mosaic
Printing Your Project:
Once the files are ready, you will be presented with a screen that
says “Ready to Print!”. On this screen you will be presented with the
files you have created for your project, which for us are the
butterfly-1.msf which goes to the Mosaic Palette+ and the
butterfly-1.msf.gcode file which is your newly created gcode file.
You will also be presented with “Materials Used” for the project,
“Number of Splices” for the project, and “Number of Pings” for the
After this, you will need to turn your Creality Ender 3 on if it isn’t
already. After making sure that you have all your components set up
and assembled correctly, then it is safe to begin the printing
Depending on your specific project will determine how long the
printing process takes. But once your printing process is complete
you will be presented with your beautiful multicolored 3D butterfly
(or whatever your project was)! After printing is finished, you
should let the project cool before you attempt to remove it from the
tray. Once it has cooled you can now gently pry the project off of the
1 The CR-10 is, on a broader level, an Ender-3 with 2 lead screws and a slightly different board.