refill length calculation wrong?

[arpruss]

Description

When I look at the Robopaint code, I see that the paint refill distance calculation assumes 22.4076923 steps per mm: https://github.com/evil-mad/robopaint/blob/3215224f8c4e06c4ee3e995fa4d02f136370c896/resources/scripts/main.settings.js
(There is also a confusing comment in the code that gives the conversion the wrong way around.)

However, that can't be the right value, since maxArea.height in the cncserver watercolorbotpen.ini file is 3600, which would yield a maximum drawing height of only 160.6mm or 6.3in.

I don't have a WCB, but I came across this while trying to port the cncserver code to work with the Mostly Printed CNC.

Can you tell me what the true step size is?

I am guessing it should be closer to 18 steps per mm.