I note from some TV adds that double sided printing is now getting more affordable, and as this probably involves more handling of the paper, and perhaps bending it around rollers (to get to the other side), I'm wondering how good these machines are. I used to have a perfectly usable laser printer, until its rollers stopped gripping the paper, and that I believe was caused by the paper's dressing getting embedded into the surface of the rollers. Washing and scrubbing with detergent/brush didn't improve matters, so that was the end of that printer. My ink jet printers use a much straighter path, but these too show the same problems after being used for some time. Envelope printing is often the first to indicate that slippage is taking place, when it didn't when the printer was new.