Mold for silicone sock for e3d Volcano clone (genuine Volcano has screws placed bit different). It is 3mm thick.
Sock for genuine E3D Volcano: https://www.thingiverse.com/thing:3064345
modified mold to make it stronger and simplified design a bit.
added 2mm thick sock
some minor fixes with part covering nozzle
0.2 or lower for better quality
Recommend using ABS, ASA or HIPS as silicone tends to stick less to them than PLA.
Making a sock.
You will need high temperature silicone sealant for this (preferably acetate silicone - it smells like vinegar - cause it's curing process can be sped up by adding water or 2 part molding silicone) . Also make sure it will withstand continuous temperatures you will use on your hotend. (300 C / 570 F should be enough for most)
Use some grease/oil on mold walls so silicone won't stick to them.
Before you put silicone in mold you need to prepare it or it will take days or even weeks to cure.
Preparation is simply. Just add few or more drops of water (or food colorant if you have white or transparent silicone and want to color it).
Mix it thoroughly until it becomes less sticky. Squeeze out any water and air that might be trapped in silicone and put it in mold.
Leave it in mold for an hour or two. In this time silicone should cure enough to take it out.
Now leave it for a day so it can fully cure.
While first heating up you might hear some popping.
It's normal because there might be some moisture and air trapped in silicone.
There is a gcode file that slowly heats up hotend as there might be some moisture/water and air trapped in silicone and with fast heating it will expand and might destroy sock.
Slow heating allows you to see if there is something expanding inside sock and you can pierce it so the pressure wont rip it.