Air Filter/purifier based on the Corsi-Rosenthal box

prusaprinters

DISCLAIMER #1! I'm not and electrician and you might not be one either. This involves wiring a simple parallel DC circuit that plugs into an AC/DC adapter which in turn plugs into the wall outlet, proceed at your own risk! The Printed Parts Printed in PLA at .2 layer height and aligned seams, standard out of the box Bambu settings.This is an air filter/air purifier housing for four 12 volt 120x120mm fans and two 14x20x1 inch filters with a variable DC power supply. The housing is pre-cut into parts, some of which can only just fit on the printbed of a Bambu X1C. The parts are affixed around the filters using printed nuts and a snaplock system at the corners. The pc fans and wiring are attached using the screws that come with the pc fans along with the wiring mounting poles. A small hole in the side allows for entry of the DC cable. Passes the “tissue test” for air-tightness and the noise it makes one meter (or 3 feet) from the fans is 34db at the max setting 12v, and 31db or even quieter at 9v, 7.5v, 6v and 5v settings. Many air purifiers on the market are in the 25watt power range. The maximum wattage of this one using the parts below is 9.6watts.The Nuts secure the 8 faces together to make 4 and the corners snap on last after the filters are inserted into the tracks of the now 4 faces. The fit is tight and the filter cardboard-edge may need to be crushed a little, this ensures a close to air tight fit without the need for glue, making filter changes in the future infinitely easier.The Non Printed PartsOne AC in Variable DC out 1000ma 12v power supply https://www.jaycar.com.au/3-12v-dc-12w-power-supply-7dc-plugs-and-usb-outlet/p/MP3312 Two 14x20x1 inch filters (I used Filtrete MPR2800) (find them somewhere on sale)Four Arctic Cooling P12 Silent 200ma 120mm Fans https://www.scorptec.com.au/product/cooling/fans/88861-acfan00135a?gad_source=1&gclid=EAIaIQobChMI2pCd2szHhwMVlFkPAh35NgEREAAYASAAEgK6K_D_BwE A little bit of extra wire (not necessarily needed)A female adapter for one of the male DC plugs that come with the power supply (not necessarily needed)Some heat shrink (highly recommended) and small cable ties or similar Your ability to safely wire a DC circuit Some advice for the inexperiencedKeep everything you install internally tight enough to never allow contact with the PC fan blades.Wire the fans in parallel.Don't forget when to put the heat shrink on.Make sure the power supply can handle the 4 fans you have.Have the fans blowing air out of the box, aka air in through the filters out at the fans, this will ensure the fans and internals never get dusty.The PC fans I used are 3 wire, only two are needed (positive and negative), as the variable speed comes from the variable voltage that comes with the power supply wall plug. You can test your fans using a 12v battery to confirm they are spinning or facing the right way before wiring and installation. Some PC fans don't like operating without the third input to control speed, buyers beware. DISCLAIMER #2My Bambu X1C has a real banana of a bed which made the “Nut” joins not as nice and flush as they could be which I find aesthetically displeasing when up close. It works great and very quietly moves quite a lot of air. Since using it regularly with two people in the room there is noticeably less airborne dust and no hay fever symptoms, well none perceived. This will not move as much air as a traditional Corsi-Rosenthal box, however it is far smaller, quieter and less power hungry, and still turns enough air to make a noticeable difference for two people.