Summary I designed this bracket to snap on to an E3D-V6 heater block and to hold a tiny microswitch as a Z-Probe for calibration. (switch source http://www.goldmine-elec-products.com/prodinfo.asp?number=G16909 ) Wire up a disconnectable harness, and just snap the bracket on and off when you want to run a calibration cycle. Note that the STL file has printed support built into the model. The STL file contains 3 separate pieces. Don't use the bracket while the hot-end is hot. Print Settings Rafts: Doesn't MatterSupports: Doesn't Matter