QMB Ender 3 hot-end and part cooler

cults3d

New nozzles are now available for the dual blower configuration. The nozzles named "2" are better suited for the dual-blower setup, as the original (smaller) ones can be too restrictive and cause the blowers to stall. The smaller nozzles may still work well for a single-blower configuration. The QMB is a Quiet, Modular, Blower-based Ender 3 hot-end and part cooler. If you have an idea for a catchier name, feel free to suggest it! Work continues on this project. I've only tested the single-blower version so far, and it works great. This design was created with several goals in mind: 1. Forcing air through the hotend heatsink is essential. 2. Preventing air spillage from the heatsink to the part is crucial when printing materials that shrink when cooled. 3. Larger openings for part cooler ducts are necessary, as the original nozzles were too small and restrictive. The back plate serves as a platform for the front plate, which holds the part cooler fan(s) and ductwork. The front can be easily remixed for different blower arrangements. I've also added an open view of the nozzle to allow remote viewing and good clearance from the heat-block to prevent overheating. Both front housings provide full access to the bowden tube fitting, and the dual-blower front housing has a full relief for the set-screw holding the heatbreak into the heatsink. October 6th, 2019, 2pm: The fixed version of the dual-blower front housing was uploaded (missing attachment points for the second blower). October 6th, 2019, 6pm: A slightly improved version of the dual-blower front housing was uploaded. October 13, 2019, 9:40pm: Version 2 of the duct nozzles was uploaded. These are more open and a bit further away from the heater block. Possible improvements include: * Creating a shroud to quiet the fans even further * Adding more clearance around the heatsink fins for better airflow * Putting finishing touches on the single-blower front housing * Experimenting with and uploading more duct nozzles * Trying a Chinese all-metal hotend and making a remix/variant of this design that will work with it.