Mold for RTV silicone sock Fits Plusreprap T-volcano. May fit original UHF without melt zone extender (not tested)

Soak the mold pieces in soapy water then assemble the mold. I held it shut with a small clamp but a zip tie would also work. Inject with rtv and let it cure 24 hrs. You can also fill the mold then insert the centre, top up the rtv and place the lid. This will squeeze out any air and fill the voids provided enough material is used, RTV should be stirred with the soapy water then poured off before injecting it into the mold. Let cure 24 hrs. Gently remove the lid first, then push out of the outside block. The sock should be trimmed on the top surface with flush cutters to form a lip for retention. Once this is done the inner form can be gently removed. 

0.2m layer height releases fine but leaves a textured surface. Use a lower layer height for a smoother appearance. Supports are required on the innermost piece, but remove easily.