The toughest part of this MK3S extruder swap is wiring. The maker is upfront that routing wires without shifting the Z motors is very hard, since the space is extremely tight. The current answer is to keep it simple: simple connectors may get tried first, and a pogo pin solution is being saved for a far-future project. That seems like a sensible way to ship something rather than wait for a perfect electrical setup.
The design, called the PitStop extruder, replaces screws with magnets, and the front half plus motor assembly comes off by hand with no tools. It runs an E3D V6-style heatsink and hotend with a silicone sock, a compact black stepper on the carriage, and a metallic push-fit fitting at the top of the filament path. Cooling is handled by a square axial fan behind a yellow grille with embossed lettering, plus an angled radial blower for part cooling.
Two details stand out. First, the extruder was tested for a full year before being released for feedback, and the maker reports no issues with hotend positioning consistency. Second, glue was used to hold parts in place as a precaution, and that step is going into the assembly instructions.
The obvious trade-off is weight: this one is about 30 percent heavier than stock, though the maker notes it is still half the weight of the empty bed. In my view that is a fair price for tool-free service and better cooling, which were the stated aims. One open item: there is no version for the stock Noctua fan yet, although the maker says it could be modified to take one. Designs are due out soon for free, with every step to be documented in videos. Many iterations happened along the way, sadly none documented.
Project by MihaiDesigns. Watch it on their YouTube channel: