To answer the (?) next to "correct", here's solidoodle support's instructions:
http://support.solidoodle.com/hc/en-us/ … Solidoodle
They reckon the voltages should be X=1V, Y=1V, Z=1V and E=0.25V. Are you measuring the right pin on the trimpot (as suggested in the instructions above)?

I second wardjr, don't adjust if it's working!

That said, I highly recommend adjusting by ear if you have the time/compulsion. Printrbot has a calibration guide that might be a little on the simple side but gives a good idea: http://help.printrbot.com/Guide/Adjust+ … h+D%29/115

Ah, I was measuring across the pot, I'll remeasure when I have the cover off again.

Thanks!

I second wardjr, don't adjust if it's working!

That said, I highly recommend adjusting by ear if you have the time/compulsion. Printrbot has a calibration guide that might be a little on the simple side but gives a good idea: http://help.printrbot.com/Guide/Adjust+ … h+D%29/115

So my board looks like:

(Well, without the camera shake), and the Vref readings from left to right (X,Y,Z,E) are:

1.634
1.631
1.665
1.553

Are those close enough to the correct(?) values of 1.5 that I should leave them?  Are they high because Solidoodle carefully (ha!) tweaked them for proper operation with this particular printer?  Should I leave them alone or set them to 1.5?

And what board is this called, so I know how to reference it when I ask about firmware updates for the E3D hotend?

Thanks!