Chipmunk Crushers have been around for decades. The Chipmunk is a very solid high performance 300 lb crusher mostly used in laboratory. Its jaw opening in 2 1/4″ x 3″. The Chipmunk Jaw Crusher cost around $4500 without motor and $7000 with motor. An alternative to buying a chipmunk crusher is the 911MPEJAC23 rock crusher without or with motor.