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Awesome tutorial on DIY frames, this particular one for maps, but thinking for show posters. Uses decorative corner blocks, which skips the step of mitering (I don't have a table saw, and not quite ready to take that step...) and makes the process MUCH easier.
Have you heard about the engineer prints from Staples? Take your favorite picture into Staples and ask for an oversized print (they come in multiple sizes, but the largest is 3’ by 4’. They’ll make a copy right there for you, and the best part…..it costs less than $5 for a print!