Library › Mechanisms › Parallel ruler with crossed arms and slots

Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)

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

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

Dimensions

parameter	arms
value	2 × 80 mm, crossed at the middle

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From the full sheet

Parallel ruler with crossed arms and slots: every size, notes, mating features and sources. How does a parallel ruler stay parallel?