Envelope Ø96.4 × 142.8 mm (diameter × height as published by Google)

Exact dimensions. True size, no printing tolerance added.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

dimension	Diameter
value	96.4 mm (3.79 in)

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From the full sheet

Google Home (original, 2016): every size, notes, mating features and sources. What are the dimensions of the Google Home (original)?