1. Important question. Does your printer have a straight-thru paper path, or like so many twist the paper 180 degrees (turn it back on itself).
2. Those 20 pound #'s. Heavier - means tough to turn - Typically 18 pound available.
3. Printers have a lifetime. The paper path gets paper fibre plus ink. Rock-solid. I've seen products that advertise - run this product thru your printer and it will "clean" the paper path. I've never tried one. Meanwhile all the "plastic" parts suffer wear & tear. I've heard numbers like 50,000 papers (?) lifetime = 100 reams (500 pages). I think cheap paper may contribute more paper fibers and/or contain more clay to add to the poundage. Obviously clay versus paper more harmful to the "gears".
Answered on 8/1/2017 by Til from River Grove, Illinois (Chicago suburb)