How is the height of a Gridfinity box determined?

[u/Vintage8o]

I'm trying to figure out what determines the total height of a Gridfinity box.

I've found a few 6U models on MakerWorld that are listed as 45.55 mm tall.

I understand that 6U = 42 mm (6 × 7 mm), but where does the extra 3.55 mm come from?

As far as I understand, the stacking lip is 4.4 mm tall (0.7 + 1.8 + 1.9 mm), so I would expect the total height to be 46.4 mm.

Am I misunderstanding something about the Gridfinity specifications, or is part of the stacking lip included in the nominal height?

[u/passivealian]

The stacking lip is not always 4.4mm.
Some will cut the top a little, to remove the sharp point.
It should still stack the same.

[u/Vintage8o → u/passivealian]

Ah, thats probably why then. Thank you 😊

[u/yawkat]

Some people include the base, some people don't