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Well, I have to admit that after I found out about oogoo about a week ago I have gotten carried away just a little bit by the possibilities without thinking too much about technical feasibility..
So far, I have cast feet from cheap grey silicone oogoo and "professional" (self-characterisation on the cartridge) transparent silicone oogoo. The former (see grey/green castings in the pictures) seem to be a bit softer than the latter (see magenta/red foot in the last picture).
Therefore, the source materials and mixture of the oogoo would be one influencing factor.
Apart from that, one could change the dimensions of the foot in the scad file, ie making P1 larger and/or P4 smaller and/or reducing spoke count should give a stiffer foot by comparision.