120mm & 140mm Fan Fume Extractor - Large Scoop

thingiverse

After years of evading the noxious effects of solder fumes, I finally decided to take matters into my own hands and design a custom extractor system for my workshop. The initial plan was to create a desktop-based unit, but space constraints and logistical issues led me to opt for a more versatile swivel arm-mounted method instead. This setup allows for the use of an exit hose, which effectively captures toxic fumes and particulates, preventing them from circulating back into the room through filters along the airflow path. The design employs either a 120mm or 140mm diameter fan, equipped with an entry scoop and a rear exit funnel featuring a lip to prevent the extraction hose from becoming dislodged. To secure the 100mm diameter hose in place, a wire tie or hose clamp will be used. However, if your workshop generates an excessive amount of fumes, it's recommended to use a fan capable of delivering at least 40 CF/min airflow. Be sure to verify the outside dimensions before purchasing, as you may need to modify the fan collar aperture using a file. The scoop measures approximately 193mm in diameter on its front end and is constructed from 3mm thick material. If a larger fan blade diameter is desired, it's possible to increase it up to 140mm, requiring only minor redesigns of the interior void of the fan collar and filter guard, as there remains an additional 10mm clearance on each side in the existing 120mm version. This expansion would enable the use of high-performance fans like the Arctic F14 Pro Low Noise PWM unit, which boasts a rated airflow of 74CFM. To accommodate this upgrade, the resulting thinner fan collar (5mm thick) will likely require printing at 25% or more to maintain structural integrity. The updated 140mm fan collar and filter guard .STL files are now available. The mounting lug, responsible for attaching the extractor to a desktop swivel arm, should be printed in high-density material for added strength. It features four holes for M3 machine screws, which will be inserted into counterbored holes on the inside of the fan collar. To secure the mounting lug to the swivel arm, a nyloc nut and bolt will be used through either axis of the counterbored holes in the lug. Future plans include incorporating a circular string of LEDs onto a separate ring that will fit onto the inside front edge of the scoop (.STL files to follow). This addition will enable illumination of the workspace during tasks such as soldering, 3D printing, or any other activity requiring fume extraction.