Cooling fan bracket for Makerfarm Prusa I3V

cults3d

To customize this design click on the Open In Customizer link here. This bracket is attached to the left side of stock Makerfarm Prusa i3v extruder and it's used to cool down the workpiece layers before printing the next one. It improves the printing of pieces with small area layers like the test STL file attached here. To install, attach the fan to the bracket with two M3x12 screws, then attach the bracket to the left side of the extruder using a M3x20 screw, replacing the existing M2x16 by sticking a tape below the extruder to keep the nut in place makes things easier. Next, wire the fan to the Ramps D9 (+) and (-1) terminals. You can control the fan from your slicing software like Slic3r or from Marlin's Control menu. Note that fan speed is updated only when you click the rotary switch. I printed with PLA material and didn't notice any heat issues from the extruder, with material support disabled. Note that I used a M3x30 screw instead of a M3x20 because I didn't have one, so I added a 10mm spacer, that's why the screw in the pictures is longer than it should be. The fan should blow air directly toward the workpiece. Here's an OpenSCAD parametric source file for you to tweak STL files if needed. This fan doesn't replace the main fan that cools the cooling fans above the nozzle; its purpose is to cool down the workpiece.