We have recently begun having an intermittent problem with our SP-15. After printing, when the cylinder is returning to home position, it hits some obstruction about 12″ away from the feed board that causes a jolt and a significant bang. It doesn’t do this all the time (maybe 1 in every 4-5 print passes), and I cannot see any parts that would come into close contact at the point where it happens. Of course, much is hidden. I have taken a photo to show the point in the travel at which this collision occurs. Will try for further diagnosis tomorrow. Any suggestions on experiments to try or elements to look for?