Mould for making silicone sock

**Intro:**
This is my latest contribution to the wonderful open-source community. It is a mould for making a silicone sock for a standard heater block (20mm x 16mm x 12mm), which is used in many of the hot ends.

**Instructions:**
1. Print out all the 4 parts that are included.
2. Use CA glue (ala superglue) to stick the handle into the inner mould.
3. Rinse and coat the inside of the outer mould with soapy water. Fill up the outer mould with silicone to about half full. More is better t