QMB Ender 3 Microswiss (clone) hot-end and part cooler

thingiverse

This is a remix of my QMB cooler for the Microswiss clone hotends. It has not been tested with a genuine Microswiss yet! Please let me know the results if you test it with a real one! **QMB** == **Quiet, Modular, Blower-based Ender 3 hot-end and part cooler** *(if you have an idea of a catchier name, feel free to suggest it!)* Unlike the original QMB, I only made a dual-blower version of this as I figure if you're printing with extra heat, you need extra cooling. You can always trim the duct top (or simply slice it with it lowered slightly through the built plate) if you want it raised higher once pressed all the way in, or lower it easily just by pulling it down a little (it should fit snugly enough to hold). The back plate forms a duct for cooling the heatsink, and acts as a platform for the front plate which holds the part cooler fan(s) and ductwork. The front can easily be remixed for different blowers. I provided a model for a single 4020 blower and another for dual 4020 blowers for part-cooling. The dual-blower front housing has a very open area shaped to allow convection up from the heat-block, providing good clearance from the heat-block. My favorite part cooler melted while printing at 280C recently (*yes, with an all-metal insert in the hot-end*) because it was too close to the heat-block. Both front housings provide full access to the bowden tube fitting. The dual-blower front housing also has a full relief for the set-screw (grub-screw) holding the heatbreak into the heatsink. Backplate octolapse: https://youtu.be/ieJv_NF62Cg Front housing octolapse: https://youtu.be/Iz27TH-qa0U Duct nozzles octolapse: https://youtu.be/KrtulF2xaNU **Things I may change / possible improvements** As mentioned above, I *may* create a shroud to quiet the fans even further. Right now they're quiet enough that I can't hear them over the obnoxious stock main-board fan or the power supply fan (upgrading those will come first). ~~I *may* add a bit more clearance around the heatsink fins (*but not at the top and bottom*) to provide for a bit of air to bypass the fins (since they're so close together) allowing the 4010 blower to operate a bit more efficiently. It'll be interesting to see if it still cools as well (*or better*).~~ This is not needed with this hotend as the gaps between the fins is much greater than stock. The 4010 blower shows no signs of stalling and runs very quietly on mine. I *may* experiment with and upload some more duct nozzles. Those are easy to swap and very economical to print.