It's just the picture - I think what you are seeing is a shadow cast on the top of the reservoir from the spot light in the ceiling being blocked by the top case edge.
The CNC manufacturer is quite emphatic that USB 2.0 must be used... I could try USB 3.0 and I'm sure it would work, but the problem is even a small communication hiccup can totally screw up positioning and ruin a piece of work. Safest bet is simply to use what they recommend! I will at some point change over to a smoothstepper ethernet controller which is much less sensitive to interference than USB.
Craig - whatever floats your boat man lol.
Can I just get an opinion on something? I'm looking at how I can bring the mosfets into the loop since the formula board has a hybrid block installed already. As it is the bottom port is blocked by the 140mm fan...
So I was just wondering on some thoughts - I could move the fan behind the radiator and I would save the 15mm spacer which should give enough space to put a fitting in the bottom of the mosfet block.
The option then would be to have the fan pulling (ie still exhausting), which I understand isn't quite as good as pushing) or I could flip it and have it as an intake setup. The bonus there would be that I have colder air being drawn through that radiator compared to the warm case air, the downside being the two slow 120mm in the top would be my only exhaust fans.
Would appreciate any thoughts