An elastic band ligation device for treatment of hemorrhoids including an inner tubular member for retaining a stretched elastic band over the front end thereof, a plunger in the inner tubular member with a handle for sliding the plunger to generate a suction for drawing hemorrhoidal tissue into the inner tubular member. The virtual machine management system is used to instantiate, wake, move, sleep, and destroy individual operating environments in a cloud or cluster. A strand of filament from a first one of the cassettes is fed to the liquifier for extrusion.