This is the only turntable I use, it is easy to move and flat.

The model is designed for 10mm balls, for example if you have 8mm balls, then scale "rail and ball_rail" to 80%.

The rail is simply aligned and glued on.

The balls cannot simply fall out of the ball_rail.

0.2Lh/2 Walls/15% Infill/no Support

you need 6-11mm balls made of steel, glass or plastic.......