The ball launcher stopped working after being used for a period of time

You could dismantle the machine, clean up the debris on the motor, reinstall it, and it will work as new

What is the shooting distance of the ball affected by saliva

It is recommended to dry the ball with a cloth before each serve, as this goes against the concept of self-service serving. You could prepare more balls and extend the interval between each balls appearances

Can it be used outdoors?

This is recommended for indoor use, while the MAXI model can be used outdoors.

Can I use a ball with dirt or dog hair on it?

Not recommended, this will shorten the service life of the machine and even affect the operation of the ball launcher.

Can a ball of the same size be used instead, or can a tennis ball be used instead?

Not recommended, as we have specially customized a ball for this machine, which is hollow and has a weight that matches the required launch distance; The size of a regular tennis ball is larger than the launch port of this machine