This is reusable Mold for an E3D V6 Silicone Cover (only for clamped-thermistor V6 heater blocks), i got this idea from the german youtuber sehertest who made a similar mold for the merlin hotend.
The Mold consists of 3 parts, which are held together by a M4 screw and a 6mm steel rod, if you dont have a suitable rod you could also use the smooth part of a 6mm drillbit.
It is possible to use magnets to mount a vibration motor on the rod.
you will need about 5.5g of high temp silicone. (i used this one http://www.ebay.de/itm/TFC-Dubliersilikon-S-ROT-mittelhart-Shore-33-1-1-HB-500g-/391144979833?hash=item5b120ebd79:g:6-gAAOSwstxVVfpu)
Before using, remove the support in the hole of the inner mold and drill out the holes of the inner and outer mold with a 6mm drill
and as always, the freecad file is included