This is the substitute for Lee Tippi which I mentioned before , in G+ and I finalised the stl files. , I use normal acidic silicone with a little bit of corn starch ( mixed well, need to work fast to avoid too dry to work on ) around 1:5 to 1:8, depends on your preference, and it dry within an hour, it cure 100% and ready for use the next day. Acidic smell will go away once dry 100%.  I tried silicone without adding corn starch, it works too, but takes a few days to dry.I can make 12-15 sets of silicone tip with a new tube of 300ml acidic silicone . The mould can be scale up for larger size. I coat a layer of dish washer soap on the mould before I apply silicone on it, beeswax works too.