Foam Board Channel Cutter

thingiverse

For all those foam board RC airplanes from Flite Test. It speeds up cutting the channels for the A and B folds that appear in their designs. It quickly makes a channel of just the right width without the risk of cutting all the way through the foam. Lay a ruler down along the left side of the channel and push this guy along its length. It seems to work best if you put most of your weight toward the back of the cutter as you're pushing. Takes two trapezoidal utility knife blades. Hold the whole assembly together with two 15mm M3 cap machine screws and nuts.