Bento Box Duct for QIDI Plus 4

The QIDI Plus 4 doesn't have enough spare volume in the chamber to include a Bento Box filter. This model allows the bento box to be installed under the bed while still being fixed in place and intaking air from above the bed where the fumes are generated. This sacrifices 53mm of Z height in the print volume. The design includes stop blocks that fit around the Z lead screws to allow the printer to self-level the bed the same way that it normally does without colliding with the bento box assembly. The duct has internal features that allow it to be reliably printed completely without support on its flat side. Printing with a brim or mouse ears is recommended. The duct is designed to index against the wall of the chamber and screw heads that are protruding from the floor of the chamber to make sure that there is no risk of the duct moving and colliding with the bed once it is placed. The stop blocks also index with screw heads. The power cable for the Bento box fans can be routed through a hole in the chamber that leads into the electronics enclosure in the back for the chamber heater wires. I opened up one of the holes in the back fan panel of the printer to allow the barrel jack to pass through. I installed a $5 thermostatic switch in the fan power connection so that the fans will automatically turn on when the chamber exceeds 40C. The Qidi Plus 4 needs the entire bento box and duct to be printed out of ASA/ABS. The PETG Bento Boxes that Voxelpla sells will deform due to the hot air from the chamber heater that is blowing right next to it. When printing the Bento Box model out of ASA/ABS, the holes for the 4mm x 2mm magnets will shrink by 0.3mm and the magnet will not fit. This is very easy to fix with the appropriately sized drill bit. Having the Bento Box on its side means that the CMAG needs to be filled to the brim to prevent air from flowing around the carbon pellets. This is a lot easier to do with the updated “NEW” CMAG design by VoxelPLA. They haven't published the files for it, so I remodeled it and added to Printables because I needed mine to be made of ASA. I built my Bento Box using the 4028 fans that Voxelpla sells and I am happy with the performance. I can't speak to the effectiveness of using 4020 fans.