Part of IQ Puzzle game

I made the missing piece to a Smart IQ Puzzle game.
The model is made in OpenSCAD and fits perfectly into the game.

When printing, I ended up splitting the model in half in the slicer for a smooth finish and then gluing those together. I used PLA for printing.

If anyone manages to print the model without gluing and supports to achieve a smooth surface, let me know what settings you recommend.