MEGA RAMPS Kossel Delta Cooling 2020 OpenBeam

thingiverse

I have been searching for a reliable method to cool my MEGA/RAMPS setup on my delta printer and discovered the original design, but it was a bit too tall to fit underneath my heated bed and I didn't care for the MEGA mount. The original concept had many redeeming qualities. First, I modified the duct to make it smoother with fewer tunnels. For a dual extruder setup, I left a circle in the duct where it can be drilled out if required. I extended the mounting plate that attaches to the 2020 Open Beam by 110mm, allowing the fan mount to be integrated into the original base. I found that only two M3 bolts were needed to secure the fan. A "slide-in" mount for the MEGA/RAMPS was also incorporated. There is a small hole at one end for an M3 bolt in case the mount becomes loose, but mine have all been snug with no movement whatsoever. The overall height from the top of the M3 bolts on the duct is 55.5mm. My Kossel printer's bottom corner frame pieces are 60mm tall, and the heated bed holders are 5mm above that, leaving ample clearance and ensuring the cooling system does not obstruct the heated bed thermistor. There is more than enough room for all the stepper wiring between the drivers and the bottom of the fan ducting. The fan noise is minimal at best when using a 40 x 10mm fan with 4,000 to 4,500 rpm. A fan with higher static pressure will deliver more airflow, but I found that 4 to 5 CFM works perfectly well. Update June 26, 2019 - An EXT version has been added for increased airflow. With the TMC2208's, a bit more airflow from the fan helps keep them cooler. The overall height increases by 3mm.