im assembling the mpcnc , i have chosen the specific working space of 15" x 19" for specific reasons. my table top is basically a 36" x 36" x 1.5" birchwood butcherblock, i know overkill for a table top. nevertheless i didnt buy a spoiler board, i do have some 1/2" untreated plywood. will that work as a makeshift spoiler board ?
Hey Timothy, that will work, but MDF is best because it is just straight. 
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thank you Phillip , ill pick up a sheet at my local hardware store.
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I will toss in a second vote for MDF as a spoil board.