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 ¾ full before it starts to fill the vac up, if i p