can some one email me a pic of a QR code sticker for medium density draft board. i am having problems calibrating my glowforge and need to run program i have no QR code to try to trick the GF thank you
It doesn’t actually care what material you use - as long as its flat and unmarked. You can even re-mask a piece you used previously. Folks have used cardboard 
Also, this is a public forum so you’ll want to remove your email address unless you want to get spam.
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Another mention for just a big piece of cardboard.
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I’ve reused the same sheet of basswood a few times, haha. Pain to peel off the tape inside the GlowForge logo to then retape… But it works!