This is a Remix of this fine creation:
https://www.thingiverse.com/thing:1164746

The "Truss System without crossbeam" was altered to construct a cantilever lapcounter bridge. The original elements where stretched in two directions.
A corner element was created to mount the cantilever truss to a vertikal mast.
To add a little stiffness against torsion a end element was fitted
The Easylap receivers can be mounted to the Mounting Truss by M3 Screws

Everything is held together by M3 threaded rod and some M3 nuts and washers.

The Ballast Base should be filled with concrete, it provides enough weight to let the bridge stretch at least 60cm into the track

Added:
-Truss Element (47x58X75 mm)
-Corner Element (58x60x58 mm)
-End Element (2,5x47x58 mm)
-EasyLap Mounting Element (47x58X75 mm)
-Mast Element (58x60x75 mm)
-Ballast Mast Base
-Ballast Base Formwork

I printed 4 Truss Elements and 4 EasyLap Mounting Elements and 1 End Element to build a 60 cm long cantilever truss. For the Mast I took 1 Corner Element and 3 Mast Elements. The Mast gets fixed to the Base setting the clearance of the Cantilever at 275mm above ground.

2x Base Outer and 2x Base Mast get screwed to a formwork panel to keep them in place while pouring in the concrete. Add some rebar through the holes of the Base Mast pieces to tie everything together once the concrete has cured. To achieve a nice surface finish mount the Base parts upside-down ( the holes for the 3mm nuts facing up, away from the panel)- when the concrete has cured long enough ( at room temperature 24 to 48h) loosen the screws and turn everything over, there should be a nice even surface.

For longer stretches, like 2 tiles of RCP-Track its better to build a none cantilevered bridge and just add another Mast on the other side. For a 1m Cantilever the Base will be very heavy. Also some more Mast Elements will be needed to set the EasyLap receiver at a height which allows it to work properly ( 4 Receiver on 60 cm need less height than 4 receiver spread over 100cm of Track).

Printed on Elegoo Saturn with Elegoo Water Washable Black
Settings:
7 Burn in Layers /25s + 5 transition Layers
Normal Layers: 0,05mm at 2,5s