This thing describes how to upgrade E3D V5 & V6 with modular screw-on thermistor. See instruction for the guide how to make E3D M3 stud thermistor, or purchase it here http://reprapchampion.com/e3d-thermistor http://www.ebay.com/itm/321490496841 regular 4mm long M3 stud version is here http://www.ebay.com/itm/321341736569 http://www.printedsolid.com/shop/e3d/stud-thermistor/ E3D thermistor version uses 2.8 - 3mm long M3x0.5 threaded stud, as opposed to standard 4mm stud thermistor. Shorter stud fits E3D V6 heater block without modifications, for V5 heater block you will need to tap existing thermistor hole per supplied drawing. Our Screw In Thermistor uses most popular in reprap community EPCOS B57560G104F. Hex brass body with M3x0.5 threaded stud allows you to easily screw the thermistor into a M3 hole with zero chance of it falling out halfway through a print. Simply tap the existing hole on your hot end with a M3 tap and screw in the thermistor. The thermistor leads are insulated in PTFE Tubing, 2 Pole JST Style Connector is attached to the leads ends. Included in the kit are two crimp connectors and a male JST connector housing so you can crimp the connection straight onto your existing wiring harness to allow for pain free removal of the thermistor in the future. Thermistor glued in housing with high temperature steel epoxy, high thermal conductivity of brass housing provides fast temperature feedback to reprap electronics. Maximum allowed temperature for prolonged time is 260C. Modular thermistor installation on E3D How to make M3 stud thermistor