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MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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THOR - thank you.

Update:
I found problems on z axis, fixed them, replaced motors and they work great.
This allowed me to work out all the other kinks in my build.

I go to print my first test print............................. (drum roll) Heat bed warms up. Hot end heats up. Nice new smell.
Printer homes, X and Y move to about the center of the print bed and .......................... STOP. The arduino locks up. Everything stops. It was late and I go to bed.

I suspect my values are wrong in firmware.

Marlin RC6

configuration.h items of interest -
#define HOMING_FEEDRATE {750, 750, 12, 0}
#define DEFAULT_AXIS_STEPS_PER_UNIT {655.36, 655.36, 40960, 6953,59} // ToyREP
#define DEFAULT_MAX_FEEDRATE {30, 30, 1, 5}
#define DEFAULT_MAX_ACCELERATION {300, 300, 1, 17}
#define DEFAULT_ACCELERATION 150
#define DEFAULT_RETRACT_ACCELERATION 17
#define DEFAULT_TRAVEL_ACCELERATION 30

#define DEFAULT_XYJERK 5.0
#define DEFAULT_ZJERK 0.01
#define DEFAULT_EJERK 0.1

I also added inductive Z probe for bed leveling, this is the first time I have added this, so maybe something there too?

The printer is close enough to post make pictures, however. It looks cool.