Just like the balsa fins -
You should clean up the laser cut edges with 320 grit.
Left as is, the cardstock vane edges will soak up paint and end up looking rough.
Run a thin bead of white glue down the edges that will be exposed.
Smooth down the sides with a finger leaving a round bead of glue.
After the glue dries, sand smooth with 400 grit.
You'll end up with a rounded, glossy finish edge after painting.
The balsa adapter was a bit wider than the outside diameter of the tubes.
The sides were sanded using my block.
Slowly sand and check, then sand some more.
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