Cobblebot Basic dual blower print fan bracket

thingiverse

This bracket mount is designed to slide onto the long edge of a Cobblebot Basic/Beast carriage and has two angled pockets that allow for ventilation with 5015 style blower fans (centrifugal or squirrel fan, 50mm diameter, 15mm deep). The fan angle permits them to pass under the gantry rail when moving to Y maximum position. For this build, I used a 50mm brushless blower fan available on Amazon. Here are the print settings: Printer: Cobblebot 1A Rafts: No Supports: No Resolution: 0.4mm Infill: 50% Notes: Print in ABS or Nylon filaments that won't go soft while suspended over a hot bed for hours. If you're having trouble fitting your blower motors into the bracket, adjust the OpenSCAD lines to fit your motor's mount tab precisely. Assembly and installation: Insert the blower housing tab nearest the exhaust into the mounting bracket with the exhaust pointing toward the Y maximum direction. Secure it with an M3 x 25mm screw. Before installing a second fan, slide the bracket through the space between the Y rail and the belt that drives the carriage. Slide the mount onto the long edge of the carriage facing toward the Y maximum direction. You may need to trim or reposition the zip ties holding the belt to the carriage (and/or trim the mount bracket) to get it to seat against the carriage edge. Use a 2.5mm zip tie through either side of the carriage belt slot to fasten the center of the bracket against the carriage. After installation, verify that your printer can move to all four corners of the X/Y gantry. At Y maximum position, the fans may stick out several millimeters beyond the frame (including outer Z wheels). Be careful not to let the fan run into something close by -- if necessary, trim off the unused outward facing tab on the blower housing. Unfortunately, you cannot put this bracket on the carriage side facing Y minimum because it may interfere with homing operations depending on your Y home switch setup. This part was designed in four 2.5D slabs (DXF format) using Qcad and then extruded and stacked in OpenSCAD. It's not perfect, but it works. If you plan to rework this, save the OpenSCAD and DXF files together in the same folder. The screw and mount pockets have some fudge factor values that worked for my assembly.