Thanks Colin. I really like your giga-mosaics, by the way.
I gave the box a textured paint finish to hide the 3D printing lines.
Also I discovered that I can't communicate with the temperature probes when the stepper motor driver is enabled, due to interference caused by PWM. Fortunately I designed the focuser to operate in full step mode so that the stepper can be powered down when not needed to move, without loosing position.
One LED is the 12V power indicator and the other two are for the heaters.
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