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I used 1/2 inch PVC Electrical Conduit. I cut it all up into 3 inch pieces with a chop saw and glued them all together. Then I built a box out of foam core board just to have a back for markers to hit so they didn't go all the way through. I used foam core cause it was cheap and easy for me to work with and the marker storage just sits right beside my table on a shelf at arms reach. I was going to use copper pipe but it was more expensive, but with the walls of the copper pipe bieng thiner…

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