Lower beam

Lower beam: notched 5 mm, leaving a 6 mm cog

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	notch
value	5 mm deep

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From the full sheet

Watari ago (cogged cross joint): every size, notes, mating features and sources. What is a watari ago joint?

Other sizes

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