Replacement cap - part 1

A very simple 3D model to be designed in Blender. The aim is to produce a replacement cap for an item which is no longer manufactured. The product will be produced by 3D printing eg. Shapeways. The original design did not work well and the cap broke quickly. The first stage is to produce a rectangular block with a variety of apertures of varying sizes/shapes to determine which aperture is the best fit for the body. The body/cap need to form a watertight seal and there is a rubber seal built into the body so all that is necessary is to design (then select) the optimal aperture for the 3D printed material. The second phase (not included in this project) will be to design the housing to match the original design as much as possible with the correct aperture.