A clean, minimalist flat bar designed for fingerboard tricks. The pieces lock together you don't need glue. If it is too tight you can rescale a little but for me works fine. 
 

To optimize the fit and increase assembly clearance, I recommend using thermal expansion to your advantage: chill the rails in a freezer and preheat the base. This ensures a perfect press-fit that's secure enough to eliminate the need for adhesive.
 

No supports.

Wait until the print has completely cooled down, then press the rail into the base. The tolerances are very tight, so it’s designed to fit by friction and doesn’t require any glue — though you can modify it if you prefer.