Unless you've already ground the meat, don't bother grinding to make jerky. Jerkys FAR better made from sliced muscle and not ground up.
Make your own marinade with soy sauce/worchestershire sauce as a base. Add whatever spices you like. I add onion/garlic/cajun/cayenne and whatever else looks good...along with some curing salt.
Then all you do is dry it in a dehumidifier. Done.
Pointless to bother with grinding the meat and dealing with an extruder...just adds a bunch of steps and equipment you don't need at all. Plus extra time spent for no benefit.