Panda Station Desiccant Tray

The desiccant trays can be printed using any rigid filament you like.  I used PLA, but PETG, ASA, etc. also will work.

Up to four of these desiccant trays will fit in the bottom of the Panda Station, under the bottom shelf.  Pull the bottom shelf forward and lower the desiccant trays onto the bottom of the cabinet from behind the shelf, then slide them into place.  

I used three desiccant trays and added a 120mm quiet fan to add air flow.  The fan I used is an AC Infinity MULTIFAN S2, which is USB powered.  I purchased the fan from Walmart.com.  Also included in the files is a grommet for the USB cable.  I printed it with 95A TPU.  It replaces the rubber plug on the back of the Panda Station, centered near the top behind the drawer.

The lids include an open honeycomb grid, mainly to keep large things from falling into the desiccant.  The honeycomb openings are fairly large, and thus will not prevent desiccant from spilling out if you turn the trays sideways.  

I included the FreeCAD files for anyone who desires to make a remix.

Lastly, my door is not perfectly flat; there is a small gap between the center of the door and the cabinet flange at the top and bottom.  I added a rotatable latch to hold the bottom center of the door against the cabinet flange in order to reduce air leakage into the cabinet.  The rotatable latch requires the Latch_Base and Latch_Flange files to be printed and the following fasters:

Qty 2: m3 x 8mm buttonhead screws

Qty 1: m3 x 12mm buttonhead screw

Qty 1: m3 nut

Attach the Latch_Flange to the Latch_Base using the m3 x 12mm screw and m3 nut.  Optionally, add Loctite to keep the screw in place.  On the bottom of the cabinet, center front, there are two m3 x 5mm screws to be removed.  Screw the Latch_Base to those screw holes using the m3 x 8mm screws. 

There still is a small gap at the top of the door but, with regard to effectiveness, my room currently hovers around 54% humidity, and the inside of the cabinet is around 24%.  Humidity jumps up quickly when the door is opened, but goes back down pretty quickly after the door is closed.  However, if loaded up with a lot of damp filmament spools, especially cardboard spools, it may take a few days for them to dry out and get the humidity down.