The design is mostly straight forward.  It will be a TPU based filament that holds the ULPA filter compressed in place.  The fan will optionally be centrifugal (default) or axial.  Additional prefilters will be optional. is the original design in Fusion 360.  Several models will be redesigned for fit and new performance in OpenSCAD.

Based on the M12 lithion battery pack and USB-C powerbank.