With this 3d printable mold you can cast silicone sleeves for J-Head hotends. There are STL molds provided for: 0. Two casting molds with heater cartridge entering either 4 x from the right side or 2 x left / 2 x right 1. Generic J-Head with heater cartridge but no cutouts for thermistor wires 2. Generic J-Head MK V with heater and cutout for thermistor 3. Generic J-Head MK 8 with heater and cutout for axial thermistor 4. A STL model of the silicone sleeve 1. 5. A small cup for mixing of the silicon casting slip