Do you have to fire the microwave kiln in a separate microwave oven?

You may want to set up a separate microwave oven in your glass-fusing work area. But this is not essential. You can use a kitchen microwave oven to fire the MagicFuse. But you should clean out the microwave oven after each fusing session. If, however, you fire ceramic fiber paper, you might want to fire glass in a separate oven. This is because fiber paper produces fumes.