WIPES- The simple wipe is the easiest shutoff to construct. However it forces the plastic wall to be no less than 3 degrees, and the sides of the opening only need draft angles. Short of using a side action this will get you the squarest opening. Obviously one can not texture the face of a shutoff so the metal must be masked in the area of the shutoff prior to etching. Texturing around wiping shutoffs is tricky and rarely results in perfect texture on the part edges.