Simple container with filament holes at either end. Designed to hold a piece of foam inside. The foam wipes dust off the filament as it passes through.
The internal dimensions and 45° twist lock cap are the same size as my 2nd generation dry-box filament pass thru, so foam cut to fit the pass thru will fit in this and vice versa. The caps are interchangeable between the two also.
The author marked this model as their own original creation.