Download the custom marker labels PDF file (for custom markers), or the ArUco markers collection (for making walls).Print each file on 2 inch by 2 inch adhesive labels with 1/8 inch spacing between rows. We use product OL330WX from OnLineLabels.com.The vendor says these labels can be used in either a laser or inkjet printer. We take them to FedEx/Kinko's and have them printed on a high end commercial photocopier. Do not use them in a regular photocopier.