Customising your 3D Print: If you print with the cheapest material, Please watch this YouTube video by 3D Printing Nerd (featuring Punished Props) - this video has useful information that can help you get a super smooth finish.
3D Printed plastics are fantastic for DIY projects, you can use anything you're most comfortable with including (but not limited to):
model airbrush paints
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You are free to make tutorials on how to customise these, but don't claim my work as your own model - make it clear that you bought the printed model from Shapeways.
You can sell customised versions if you have messaged me and discussed details about it first, and you must be completely transparent with your customers; don't hide the fact that these were originally from Shapeways and modelled by someone else.