Determining the perfect prize size for your toy crane machine requires understanding several key factors. First, measure your machine's prize drop chute - this opening determines the maximum size any prize can be. Typically, standard crane machines accommodate prizes between 2-4 inches in diameter.

For capsule machines, consider both the capsule size and the toy inside. Common capsule sizes are 1.5", 2", and 2.5" diameters. The toy inside should fit snugly without rattling excessively. When using plush toys, compressed size matters more than unstuffed dimensions. Test if the claw can properly grip your chosen prizes by observing pickup success rates.

The claw mechanism itself dictates what it can lift. Measure the distance between claw fingers when fully open - this determines maximum prize width. Heavier prizes require stronger claws, while very light items might slip through. Always leave some clearance between prizes in the pile to prevent jamming and ensure fair play.

Regularly test different prize types and observe player success rates. Balanced difficulty maintains entertainment value while ensuring occasional wins. Remember that prize visibility affects appeal - slightly smaller prizes that are clearly visible often perform better than larger, hidden items.