Printrbot fan ducts into three streams

thingiverse

Printrbot Metal fan duct keeps tall parts upright by cooling evenly across both sides. Print Settings Printer Brand: Printrbot Printer: Simple Black Rafts: Doesn't Matter Supports: Yes Resolution: .15 mm Infill: 1.6 mm shell thickness Notes: Scale up to 25.4 scale as it was designed in inches. Rotate so prints come up from the square flange. Use baseplate-only support if your printer is zoned. Pictured in ABS with the installed duct printing the next duct copy. The small dime on the inside of the flange can be removed to increase airflow. It's there for easy printing. Tall towers tend to lean into airflow, so when expanded to 10 inches tall, flow from only one side caused tall thin parts to lean. Breaking the flow into three flows prevents leaning. Many obstacles in the Printrbot Metal are reflected in this file. If you don't have that printer, leave off localized thinned portions of the ducts. Hand tap with a 4-40 tap and get a good vibration-tolerant thread fit on metric screws from Printrbot Metal. This avoids needing backup nuts on four flange screws. Don't over tighten as it will strip plastic threads and drag down the fan motor if the fan is bowed during tightening. Just tighten until screw heads touch down and no more. Tight threads keep screws from backing out for a long time.