yes, you need the board to be as flat as possible.
even better than tape, use some of your scrap 1/8" material and make some of these hold-down pins to put around the edges of the board.
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yes, you need the board to be as flat as possible.
even better than tape, use some of your scrap 1/8" material and make some of these hold-down pins to put around the edges of the board.