IMO, almost everything is repairable, and many if not most are cost effective compared to printer replacement. A few parts are ridiculously overpriced if you don't shop around. The bugaboo is diagnosis, when the culprit is not clearcut. Over the years I've replaced the service station, carriage belts, carriage mechanism, color sensor, formatter, paper sensor, drive gears, supply tubes, and some other miscellaneous failed bits. Some replacements are tedious to make, but all are well documented and generally require no special skills beyond following directions.