It does not support 4 axis, the two Y axis connectors are designed to receive the same control signals. They just have independent amps.
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The issue is to bring the cost down to that $40 I would have to order 75 to 100 boards at one time (Not to mention solder all the boards myself, as assembly fees are ridiculous). If you know 75 to 100 people that want one let me know and I can do it for $40 otherwise I only buy 3 boards at a time and charge as I do go with the charges of small batching. Donât forget this is not my fulltime job, thatâs why I posted the circuit so people can make them themselves.
Just saw your backup and running 
be careful with just the caps, donât brick another Gshield.
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Why the new Gshield, why not just replace the the caps?