Send some box spec.
How does look noise on your box ? Is 5V+ separated from any possible noise in your device ?
Difficult to say if that would affect UM electronic (which is simply just Arduino + rebuild motor shield), the best way is to check what is current needed by your box, then check noise on oscilloscope of your 5+ and GND.
I haven't checked schematics for motor shield on UM but I guess there will be one 5V+ line, so no matter where you will connect, just make sure that current will be appropriate for +5V line, and make sure that you won't connect some noisy device as it can affect work of Arduino (I haven't check how well is designed separation on motor shield from UM, so I can't tell you more).
Basically if your device has low noise and has low current then you can go ahead and connect to UM +5V line, just make sure that current won't be too big.
If you need more specific help let me know.
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peteruithoven 4
No tips on where I could add a 5v power plug on the Ultimaker board?
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