Thien dust shavings collector quick simple

I ve been meaning to make a collector for my vac for a long time because the filter bag sticks down into the container when you get enough in it slows suction down empties itself onto the floor when it s opened for emptying :(, yesterday i found a container at the local tip today found enough time to throw together this, A piece of Mdf with a groove cut in to fit the tub rim a couple of pieces of 40mm waste pipe, simples I can fill this to about full before it starts to fill the vac up, if i p br, br,