Flash Forge Inventor I FlashPrint Leveling

I have a FlashForge Inventor I and I use FlashPrint as my slicer. Many of the bed leveling calibration files here would not print using FlashPrint. I think FlashPrint requires at least 2 layers.

This bed leveling thing has 9 squares that fit just inside the print bed of a FlashForge Inventor I. The bed dimensions are 230 x 150 x 160mm.

Note: Because FlashPrint appears to require at least 2 layers to print, the actual .gx file will print 2 layers. Stop the test print half way through to have only 1 print layer, which is how you calibrate the print bed. You don't need to do the second layer for calibration.