> figuring out an inkwell that doesn't splosh ink around everywhere or floats just over the bed is probably more work than the idea is worth

What if...

- cut a custom bed out of a piece of plywood or something, letter-shaped so there's a few cm of open space along one side

- position an ink well directly under the Z gantry

- set your Z offset such that the tip of the quill is 0 and set your min-z to -5cm or something

Refilling the quill would then be homing the X axis and dipping the quill down to negative Z.