Rigidbot 2 part cooling fan duct Rev2

thingiverse

This Rev2 version has a beefier fan mounting arm for those who had trouble with it snapping on the original. This is a high efficiency fan duct upgrade for the stock part cooling fan on a Rigidbot 2. This fan duct attaches using all stock parts so no modifications or extra parts are required to install it on a Rigidbot 2 printer. For best results read the print settings carefully. The clip on the fan snaps onto the front bearing mount easily but securely and is easy to remove if needed. The pictures show the orientation and sequence to attach the fan duct and install the stock fan. (Same steps as the original so using some of the same pictures) The fan duct design directs a concentrated high flow moderate pressure stream of cool air across the tip of the nozzle parallel to the top surface of the part removing the heat quickly from the area. This results in a much more uniform cooling pattern and surface finish even across thin and small parts greatly reducing warping and curling. Bridging capabilities are enhanced and features on the far side of the nozzle are stabilized. It is a truly awesome sight to watch the printer effortlessly create bridge spans of at least 15 mm with no visible sag and horizontal overhangs of up to 5 mm that are flat by the third layer. I use this piece as a test piece. https://www.thingiverse.com/thing:1088310 The air stream passes below the heater block so as to not cause temperature fluctuations across the head. The duct will clear all parts of the printer and does not interfere with or touch the guide rods. Since this is a precision fit part I highly recommend using calibrated filament. My filament calibration object of choice is found here as it calibrates for the average diameter of the filament being used and its thermal expansion and cooling properties: https://www.thingiverse.com/thing:1037301 To avoid melting the end of the installed duct it is recommended that the heater be pushed in nearly flush with the front of the heater block. The STL file is Cura scaled and oriented for printing. Print Settings Printer: Rigidbot 2 Rafts: No Supports: Yes Resolution: 0.1 mm Infill: 24% Notes: Instructions below are for using PLA. Modify as needed for your material of choice. This part will need supports with an overhang angle between 60 and 45 and fairly dense in the range of 25 - 30%. I also recommend a brim of 7 - 10 lines to anchor it to the bed more securely especially for the fan bolt mount which is the only place the part itself touches the bed. First layer is printed at 0.2mm and the rest are at 0.1mm. Use a 0.8 shell and 0.8 top and bottom thickness at these resolutions. Start with the bed at 60 C and turn it down to 45 on layer 4 (0.5mm high). The stock cooling fan comes on full at layer 5 and provide adequate cooling for the first print of this part. I used my first test prototype to cool my second and final print. You may want to print a second fan using the first one produced using the stock cooling duct. As mentioned above use calibrated filament for best fit results. Post-Printing Post print clean up Remove the support material from the back of the duct and any strings inside the duct. you should not have any support material inside the duct itself.