Purchasing a dedicated stuffer has made a HUGE difference. I was using the Kitchen Aid grinder / stuffer attachment it was a headache doing the stuffing. I've only used natural casings to date. What was the problem with the collagen?

It helps a lot if you can dip a little water inside of the casings to keep them lubricated as they slide off of the stuffing tube. I have also found that soaking the casings overnite makes them much easier to work with. Although I use plastic tubes because that's what came with my stuffers I agree ...