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Looks like they will be making methane on Mars anyway before building anything permanent.
SpaceX_Mars_colonization_program
Methane was chosen for the Raptor engines because it is relatively inexpensive, produces a low amount of soot as compared to other hydrocarbons,[28] and can be created on Mars from carbon dioxide from the atmosphere and hydrogen via the Sabatier reaction.[29]
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methane
That was my thought too, after reading about the manufacturing process.
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One approach I would imagine then would be to first transform the CO$_2$ into CO or methane CH$_4$ before using CVD to form carbon nanotubes...