[trinsic2]

How did you find the servo to eject the cartridge? You mentioned occasional jams, is that because of the style of cog, or the lack of pressure from the servo? I wonder if there is some tensing or alignment issues from the plastic cog..

I wonder if metal would better.

[abeisgreat]

It actually never jammed I was just afraid that it would! It's just a generic micro servo, I think from Adafruit probably.

[trinsic2]

Ohh I mis-read that then. Thanks for the reference. I'm just getting into electronics myself and that site looks great.