Ha, you guys are way over my head now :-) Thanks for the responses.
I had ordered a pack of two servos – they’re the exact same ones that come with the kit. I installed the second new servo this evening to test. I also used a different USB cord, moved the eggbot further from the computer, and plugged it into a different outlet. The issue persists…
I made a video and uploaded it to youtube – the sound is bad, but there’s a running commentary.
During the video I say that the pen down looks good, but it does trend upward. Pen up and down positions are set to 66 and 47, by the way.
I would be happy to send any combination of parts to you for testing – just let me know the address. Let me know if there’s anything else I might try on this end. I’m dead in the water at this point.
Thanks,
Jim