I'm having a problem with this model. I made this using 2 inch PVC (and I did resize the auger). While its running, it occasionally (every 2 full turns or so) it seems to jam. The auto reverse fixes it some of the time, but quite often, it just seizes all together until either I help it along, or it finally gets it self free (which often takes quite a while). The auger is relatively comfortably fit inside the pipe, but there is a little bit of friction when I manually turned it by itself. I have no idea what could be going wrong!!