If you want colors in curves or diagonally slashes, this ist not possible. There are no such paint tools. See Foto attached, the red diagonally line.
Also it is not possible to get steps back after slicing, into the color mode (in case you made paint mistakes and want correcting it). You have to close the project and open it again.
I wanted to see if I could do something like this so I gave it a try. In the attached image, I rotated the object -10° then used a height range of 60 and clicked with the mouse pointer on the far left lower point. I then rotated it back to 0° which left me with a diagonal line. I admit it might be tedious with your particular model but maybe you can get what you want.
I agree that there is no single step undo which is very annoying for anyone that has used a drawing program before. If the painting is extensive, you may have to do a file save as to save incremental versions. It’s a kludge but it should work.
The word hello was added by clicking on the almost invisible keyboard symbol next to “erase all painting” and noting that shift + left mouse is erase. It won’t work with height range selected but works well with circle and I assume the other shapes as well.
Model the colors of your print as separate components, load as a single object and then assign the colors you want to the parts. You have infinite control over coloring this way. The painting method in Studio is really only for people who don’t have CAD capabilities, or who need to do something quick and don’t want to go back in to CAD. But doing it in CAD is best. That’s how I did this lettering. The logo is separate 3D STLs, one for the grey and one for the red. I model them relative to the white main object in CAD and then bring all three components in to Studio as a single object. Then I just select the component I want and assign the filament color to it that I want. No muss, no fuss.
Also, when you use the “paint” functions (vs. Fill or Triangle functions), the slicer is modifying your geometry to add facets for the paint you’re applying. I wouldn’t use these functions for that reason alone.
And if you decide you want to make changes to the model, and you’ve painted your model, you’ll have to abandon the painted version to go back to the source version in CAD, and then you’ll have to paint again. If you use the separate-parts-for-each-color method, you don’t have to repaint anything when you make changes. Just select the part and “replace from disk…”.
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