That center well is for this:..While we're waiting ..take a second gander at @Shawn Hoefer 's plan for one cool work stationSweet!
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The small well in front of the white spools is for an ohm meter.
The well at the end is for an i4 battery charger.
Glad you like! I built it in a cad program and submitted it to a 3D printing company. They said it would only cost something like $3500. I thought I'd buy 2...