Customizable Mold Maker

Hit the Customiser
button to make your custom gasket mould.

Parameters are the inner and outer diameter, the thickness, and the shape of the cross section (see image). If you use the rounded square or ellipse cross section, with thickness set to (Outer diameter - Inner diameter)/2, then you will get a standard O-ring with perfectly circular cross section.

To speed up curing, you can opt to have little venting holes in the mould. It is recommended to use more and/or larger holes in larger moulds, otherwise it may take extremely long for the compound to cure inside the mold. In theory you can also use these holes to do injection moulding: if you set the number of holes to 2, and make them large enough, you can inject silicone through one of the holes until it comes out through the other hole. I tried it and it works, but this will probably only be practical for small gaskets.

The mould relies on a cone to align the two halves. In the ‘advanced’ settings you can tweak the tolera