I own a Creality Ender 3 printer, and have been printing on it for about a year.
I thought it might be fun and instructive to build a Neutron printer (https://cobyhuang.com/ATOM-Neutron) using my Ender 3 to print the parts.
The Neutron printer can use either an E3D hotend, or an ATOM 2.5 MK3 hotend.
I think that the E3D hotend is more common, so I think that is the one I'll go with.
It occurs to me that the heater block for an E3D hotend uses an M6 thread for the heat break and the nozzle. Likewise, my Ender 3's heater block also uses M6 threads.
Here is my question, it is possible to replace the heater block and nozzle on an E3D hotend with a heater block and nozzle from an Ender 3? Not that I'd disassemble my Ender 3 mind you, but it would be nice to have one set of interchangeable parts.