Simple mold for a silicone cover for the E3D v6 hotend.
The outer part of the mold is one time use only, since you will very likely destroy it when extracting the cover.
Make sure to only use a low density infill to make this easier (<=20%).
If possible prepare the mold with PTFE spray or other separation agents for easier extraction, in worst case you can do without though.
You will need 7-8 g of heat resistent silicone.
Make sure to clean out the overhang of the inner part of the mold. Any residual strings will make extraction more difficult.