Uploaded November 2023 | Updated September 2026, 3 weeks ago

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This is part 4 of making our own variometer / vario coupler. Changes to the inner and outer shells for both easier construction and better performance.

I have the updated 3D printers files posted on line here: thingiverse.com/thing:6290893
printables.com/model/632114-crystal-radio-variometer-aka-vario-coupler

This is the knob:
thingiverse.com/thing:6307198