4 channels relay case

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4 Channel relay case.

Stackable design

To attach to Orange Pi Lite https://www.thingiverse.com/thing:2674101

To attach to Raspberry Pi 2/3 https://www.thingiverse.com/thing:2674078

For mounting on 2020 extrusion

bracket available here https://www.thingiverse.com/thing:4164164