Hydrometer holder for Panzy Cereal box

This is for the Silica box created here 4L cereal box lid desiccant silica container - Free 3D Print Model - MakerWorld I have adapted the ring so that it attaches to the box very snugly. The attached silica box design fits perfectly into this 4L cereal box Panzy Home 4L Cereal Storage Containers – Airtight Flip-Top Lids, BPA-Free, Clear Plastic with Labels for Easy Organization– Kitchen Pantry Organiser – Ideal for Cereal, Cornflakes, and Dry Foods (4) : Amazon.co.uk: Home & Kitchen meaning you can close the flap and stack the cereal boxes, as it will remain flat. However, you do have to take the lid off to remove the Silica Gel box to refill the gel. but you can even glue the lid of the box into the Panzy cereal box, as a permanent fixture.  I modified this as the Panzy boxes are cheaper.  Most filament spools should fit in the box as far as I know.

Hope this helps.