Just like what it says on the tin: Scalextric to Policar adapter

This design is for copper tape, which can be secured and wired on the underside of the track thanks to the slots available.

The fit is as good as I could get:

Policar side might feel a bit loose if you are just trying out by hand but secured enough once laid flat. I was not able to print the side clip profile on the track properly and removed it instead.Scalextric side is clipped in, so no chance of disconnecting.Be aware this is a long print: 4 hours at least on regular printers.

Please, use as much support material as you need.specially on those long bridges.

Have fun!