Polistil A9 half external curb - 5cm wide
thingiverse
Here is a 30' external curb for Polistil A9 slot car track piece, 5 cm wide. Walls are 1.5mm thick which permit you to re-use original Polistil guardrails. There are tiles in relief on track side to help you color them in white/red or whatever you like. Curbs can be kept together with clips, there are two holes on the small sides to arrange them.
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