I’ve designed and made my own e3d v6 sleeves/socks. I am pretty new to Fusion 360 and silicone casting. I have less than 10 hours of experience with Fusion 360 and basically first time casting silicone. This is both a challenge to learn and make something useful out of 3d printing. please note that this is intended for the older e3d v6/v6 clone heater block.
Before you ask, here are the STLs: https://www.thingiverse.com/thing:2384586