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The D4's motherboard is very similar to the Makerbot Replicator. You can find schematics for it online. The designators ("C3") may not be the same, but because of where it's at on the motherboard (next to a voltage regulator chip) and the size of it, I'm almost certain that it's a 100uF 50V radial capacitor. Here's one that should work from Jameco: https://www.jameco.com/z/R100B50-R-Capacitor-Radial-100-uF-50-Volt-20-105c-8x11-5x3-5mm_158394.html