All parts in their assembled position (each part its own solid)

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, Xem Studio Design License — Xem Studio

Dimensions

dimension	parts
value	part a, part b

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From the full sheet

Jigsaw puzzle joint (for splitting large prints): every size, notes, mating features and sources. How do you join two 3D printed plates with a puzzle joint?

Other sizes

Plate with two round puzzle tabs
Plate with the matching sockets