Drop & Randomizer inlets for Gravitrax.
Compered to the previous ones, substantial improvements have been made!

I've completely re-evaluated the ball's trajectory. As a result, the Drop Inlet's launch speed has apparently increased, but the Randomizer Inlet's launch speed has seen a more significant improvement!
Previous ver. of Drop Hole Inlets : https://www.thingiverse.com/thing:6790164
Randomizer Inlets : https://www.thingiverse.com/thing:6790084

Differing from the prior version, the structure now expands upward. 
While my initial aim was to improve the stability of tiles on the top, I've discovered an added advantage: it has made removing the inlet more convenient!

An additional tile can be placed 15 mm above the tile with the inlet, almost always necessitating the use of a 'drop hole tile' or 'funnel'.

A video clip of 3-way randomizer intet :
https://www.youtube.com/watch?v=UwdEmI_zhKY

Personally, I've always felt that the previous Randomizer Inlets had room for improvement, so I'm finally at peace with this.