After i did the cover that you can mold around the Merlin heater block, i wanted to make a sleave that can be put over the heater.
The mold comes in three parts, just drill up the holes to 3mm and assemble the parts with M3 screws to hold them tight. It is strongly recommended to use PTFE spray or other any other separating agent. The resulting sleave has a thickness of 1mm and can be easily ripped.
I recommend printing the mold in high quality to get a smooth surface, the silicone will show every small fault of the print.