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How to design a pen which has 3 colours?

Hello,
To make my pen holder construction even more realistic, I also designed the pen that goes in the pen holder.
The original, which I traced, had a black tip, an orange body and a blue-violet cylinder on top.
I first drew the three elements as one part because they belong together, but then I could only choose one colour.
So I converted the one part into three and was able to choose the desired colour for each part.
Then I converted them back into one part using a Boolean operation, and there was only one colour left.
Then I undid it again, back to three parts, but in the assembly I have to put them together.
Is there another way to achieve this?
Kind regards,
ProApe
https://cad.onshape.com/documents/2e46db25b4738c42967f18f9/w/a5b445cdac9e4967ca3c08b9/e/cda9e91ba4987ec6d9c32817?renderMode=0& uiState=68b1a719bde21b4a12f90429
Comments
Split faces and assign colors to faces
Ok, as simple as that! I'll try it
Not so simple finally: I may not split those cylinders.
https://cad.onshape.com/documents/c6be626b76a2750c0eef4060/w/014938f5bc8df12db1fcdcd8/e/87de30c6b62ff4a45a413063?renderMode=0&uiState=68b1b62ef4ffed53e77aa39a
You can add appearances to individual faces.
ok, that worked! Did you try to split the 3 cylinders? The other one I didn't have problems to split it.
I didn't have to split anything. Just right-clicked a face and selected "Add appearance to face…"
Yes, I understood and it worked, but I should first split the part in 3 and that didn't work, as for the uniform cylinder it worked without any problem.
You only need to split the face not the actual part.
You can also create a composite part and use that in your assembly. Unless you delete the individual parts (in the composite part feature), the composite part will maintain the individual parts colours.