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I could imagine doing it with 3D-printed curvy tube, but not with little pieces of BT5. They would also tend to obscure the view of the ball somewhat.
Ping pong ball diameter 40 mm
Ping Pong Balls. Table Tennis | Ping pong balls are spherical polymer balls fabricated specifically for the sport. Established under international rules at a diameter of 1.57” | 40 mm
BT-5 is about 14 mm outside diameter.
You need three tubes for effective cage, add a couple mm for freedom of ball to rotate if needed.
14 + 2 + 40 + 2 + 14 = 72 mm
Not that big, really
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