You can either print as 2 separate parts with 1 very small support on the part that goes over the track, or print as 1 part. The 1 part will take more support and more time, is also not printed in the strongest orientation. For 2 parts the holes are prethreaded for (2) M4 flathead bolts. Simply bolt the pieces together.
The author remixed this model.
I made the profile of the base fit the Festool track perfectly, before it wasn't a great fit for Festool. I also made it so you can just place the router in the base plate without taking it out of the base. Any additional steps you have to take in the shop wastes time so now you can just place the router in the base plate and go.