I purchased an electric turntable from Amazon.

This turntable has a surface with a diameter of 120mm. Since a larger turntable costs more, I simply printed a new 200 mm plate for this small turntable.

The plate fits exactly (with gentle pressure) on the turntable - does not wobble and is firm.

I'm still a beginner in 3D modeling and 3D printing. I printed the box in Bambu Studio with standard settings (without supports) and with Bambu Lab PLA.