Hộp chứa hạt hút ẩm Parametric cho thùng Sterilite 20L

I've been using Sterilite 20L bins for spool storage, cheap and locally available and a manageable size.

I adopted using alumina desiccant as my preferred humidity control, initially in cloth bags under RCNet's rack (https://www.printables.com/model/139303-sterilite-20-qt-gasket-box-spool-rack) but I found the space beneath the rack to be too restrictive for the cloth bags.  I then switched to Ayries rack remix (https://www.printables.com/model/1029030-filament-spool-rack-for-20qt-sterilite-container-d) which raised the spools sufficiently to allow for boxes of desiccant placed below.

Finally decided to design my own box after trying several. I was looking for a compact one that fully used the space without any overhanging features and fully open as possible without spilling desiccant.

Mine is designed in FreeCad and is fully parameterized. I've attached are photos of versions constructed from the same file. The small one for test purposes (50x70x20mm), a medium box (95x200x40mm), I assume 3 would fit in the storage bin and the larger one (148x215x40mm), two fit in the storage bin.  Modified the rim size for the slot to make the lid fit easier and print more reliably.

Using PrusaSlicer, I use a infill based print without top and bottom layers to achieve the most open box (all sides are open). I found that a 15% gyroid infill had alumina sticking to the inner surface when it was emptied, so I bumped the infill to 20% for safety (YMMV with other infills and desiccant). I use a wall thickness of 2.2 to 2.4 mm for sufficient gyroid layers and stability.

Box size (mm) (WxLxH):

Weight

Alumina
Desiccant

50x70x20

11g

~30g

95x200x40

48g

~410g

148x215x40

70g

~700g

Default Print Settings:

infill

gyroid

infill percentage

20%

supports

None

Box Print Settings:

perimeter

0

layers

Top - None

Bottom - None

Box Height Range Modifier for top 7 mm of box:

perimeters

2

solid layers

top - 4

bottom - 0

Lid Print Settings:

perimeters

3

solid layers

Top - none

Bottom - None

I've included a few pre-selected sizes, but you can use the FreeCad file to create your own, or you can request new sizes from me!

The parametric FreeCad design allows for customization. All the main dimensions are in variable table for easy editing. Currently using a weekly appimage build, so if there are any issues let me know.