I created it after my second original print head got cracks.It is a drop in replacement, you can use stock bearings.The cables are fixed on the outside and the outer part is designed to be removed by only loosen the four screws.The cables are fixed on the outside and the outer part is designed to be removed by only loosen the four screws.Design is mostly influenced by https://www.youmagine.com/designs/modular-printhead-for-ultimaker2-v2-2 but I wanted a drop in replacement not changing the original size and shape too much and not to have to alter the firmware.The 1.75mm version is meant to use a bowden coupling on the top. For example https://e3d-online.com/embedded-bowden-couplings-for-plastic-1-75mm-filament.