MAJOR UPDATE:

After receiving excellent community feedback, I have revised the boxes to make the following changes:

• The box heights are now listed including the lid height. In the previous version, the height described the box without the lid. This also meant that the actual height to the base of the lid wasn't an exact Gridfinity unit. The box height has been slightly adjusted, but effectively what used to be a “3U” box is now listed as a 4U box including the lid. Please see the new size guide below.
• I have added 3 new box heights. Boxes now range from 4U to 10U.
• I have designed an additional new lid that includes slots for magnets. You can now choose between a flat lid, a stackable lid with no magnets, and a stackable lid with magnets.

It is important to note that because of these changes, the old files are not compatible with the new files. I know a lot of people have printed boxes from the old version, so I have uploaded a zip file that contains all the STLs and 3MFs from the old version. You can find it in the “Old Version” folder when you click “Download STL/CAD Files”.

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Multi Size Stackable Gridfinity boxes with snap closed lids.

The boxes from 1x1 to 5x5 in size and are between 4U and 10U tall (28mm to 70mm tall from base to the flat on the lid - see size guide below).

Lids are attached by inserting a length of 1.75mm filament and sealing with a lighter or soldering iron.

The boxes were originally designed to be used as pill boxes for travel, and take magnets in their base and tray as per the Gridfinity standard to keep the boxes together on the tray. Lids snap closed strongly and tightly to keep from accidental opening, but open fairly easily. You can find the magnets you need linked in the Bill of Materials section above.

The plain flat lids are designed to open up to 180°, but can also open up to 90° in place in a tray, making a 2 unit wide tray ideal for boxes back to back or with other Gridfinity items.

The stackable and magnet lids open a bit past 90°, but due to the extra height for the stacking, won't open in place.

To choose your size, determine the height you want from the chart below, then select the print profile for the height and lid type you want (e.g. 4U Boxes with Stackable Magnet Lids) and then choose the build plate for the size you want (e.g. 3x4 4U Stackable Magnets).

For the flat lids, the 4x4, 4x5, 5x4 and 5x5 sizes have the lids on a separate plate. All other sizes have the lid on the same plate as the box.

Note that the Unit Height is base on the stackable and magnet lids. The flat lid is 1mm shorter, for example a 4U box with a Flat Lid will be 27mm tall not 28mm. This is to enable the flat lids to open in place in the middle of other Gridfinity items.

Size guide:

The baseplates depicted in the cover photo can be found at https://makerworld.com/en/models/43181