For any part of the downloads that are designed to be painted upon with watercolors, we recommend using a 90 lb. watercolor paper.  140 lb. papers generally will not go through a printer.My favorite paper for our projects, charts, etc is Arches 90 lb. Cold Pressed.  Purchasing it by the sheet is more cost effective.  You can get six 8.5 x 11" pages per 20 x 30 cm sheet.You can use regular cartridge paper for any of the text and instructions.