First, special thanks to @madgrizzle and @bar for the calibration posts and benchmark test info. The fourth time was the charm for me on my new Maslow and its now dead on (2/6 +0.33). Patience paid off.

You’re gcode works fine.

I am drawing/designing on BiiCADo Pro (units = inches) on an iPad pro (264 ppi);

moving my DXF file to my mac (flash required) and then;

converting to SVG with convertio (have used two other solutions with the same exact results),

then importing into Makercam with the following results:

a 42" designed part comes up close to 3" onscreen (inches - yes :: at the default 72 SVG Import Default Resolution)

Changing the Import resolution setting gets me pretty close:

5.5 is too small, 5.4 is too big.

5.45 is pretty darn close to the 42" design

My number is a far cry from 72 or 90 and I can’t get my head around where the calculation has gone wrong and can’t come up with a number anywhere close to 5.45 multiplying or dividing into known numbers like inch to metric conversions (ie 25.4), 264 ppi, etc.

I would like to get the correct value mathematically if possible.

Thoughts anyone?