Silicone Sock for E3D Clone Heatblocks (short nozzle)

thingiverse

I thought pyr0ball's mold design was straightforward and worked well overall as far as fit/finish and ease of use went. However the socks it produced were about 1mm too long with the nozzle tightened down against the heat block, so I remixed it to have a shorter nozzle cover. This thing also requires printing the handle and cap from the original design here: https://www.thingiverse.com/thing:2848281 Using the resulting red high temperature rtv silicone socks is a joy. They fit very perfectly on the clone e3d heads, and they resist high temperatures much better than the original blue socks I was tying to my clone head with wire. For example printing nylon at 260C, the blue ones got hard and developed a whitish discoloration. These red ones appear not to be affected even with testing long periods at 285C. The socks are also more affordable; a small $9 tube of rtv produced 15 usable socks. My first sock lasted 97hrs of printing abs and nylon, and it was replaced because it got damaged from snagging on a curled up overhang. That sock looked otherwise new when I removed it. Some molding tips: The usual red high temp rtv you get in a tube at the autostore is all I'm using. To cure the parts fast, put the clamped mold inside an open plastic bag with a wet paper towel inside. Don't wrap the mold, just let the damp towel give off evaporated moisture. It's also important to leave the bag open to let out the acetic acid that forms from the silicone curing. The resulting high humidity environment accelerates curing enough to pop the molds safely within 16hrs at room temp regardless how cold or dry your climate may be. You don't want acid covering your hotend, so before using the socks, let them sit in the bag to finish curing for at least another day or 2 after popping them from the mold (until they stop smelling like vinegar). On a side note, putting the bag in the afternoon summer sun I've pulled parts successfully after just 12hr, but the abs mold ended up warping so I stopped doing that.