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From my understanding, most 3D printing based polymers deteriorate quite rapidly-especially if in contact with oils etc. So it might do for a short while but I don't know if I'd trust it to be load bearing like that as it will inevitably distort over time and could split.
If you have the seatpost you could quite easily get a couple of split shims milled out of aluminium or similar? Again, I don't know if wood would be prone to splitting.
You could always buy a bag of alginate, make two really simple molds of the shims and then use a hard grade of two part silicone to cast them (the kind they make cooking spatulas etc out of). Super easy, non-toxic, takes compression well and wouldn't deteriorate.