This is a basic case for the mt3608. I designed it to use an old cut off USB cable that I had laying aroung.

Input side holds a 3.15mm cable.
Output side holds a 4mm cable.

---Update

I added a variant that uses a micro USB breakout board on the power in side.

When wiring it, you will have to cross over the positive and negative wires, but I had no clearance issues doing this. So, I am just gonna leave the case the way it is.

This version still uses the same 4mm barrel connector pigtail.