Hygrometer / Relative Humidity Gauge Holder For Lock-n-Lock HPL951 3.9 Litre Cereal / Filament Storage Boxes

A simple holder to house a low cost circular hygrometer module in the front corner of an air tight cereal storage box to keep 3D printing filament clean, tidy and dry.

The HPL951 storage box is my go to container for storing 1Kg reels of 1.75mm 3D printing filament. The addition of a low cost circular RH meter gives an idea of the moisture content of the air surrounding the filament, and by extension an idea of the moisture content of the filament itself.

The model was drawn in Design Spark Mechanical 6.0 and sliced with PrusaSlicer 2.7.1.

Printed on a Creality Ender 5 S1 in 2 hours and 59 mins, using around 9 metres of 1.75mm PLA filament when set to 10% lightning infill with a 0.4mm nozzle at 0.2mm layer height. 

Printing with the narrow-edge down as pictured means there is only need for minimal (organic) support whilst resolving good overhangs on the circular elements (relies on good adhesion to the textured PEI build plate -a bed slinger may need additional brim).

I’ve no doubt it could be done much faster, but my preference is to dial everything back to get a decent print first time, rather than wasting filament on failures just to push the envelope.

Details of the heat proof silica gel storage case I use with this box and gauge setup can be seen in the following YouTube video: 

Clearly not everyone who has a 3D printer also has a metal working workshop, but maybe you know someone willing to swap some print time for some machine tool time, maybe you have a nearby maker space, or maybe my idea will plant the seed of an alternative approach that better suits the tools you have to hand.