Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3915122.
I needed a super simple, super quick test pattern to test the z-offset on my BLTouch so I whipped this up in FreeCAD. All it is is a 150mm square bisected horizontally and vertically with one solid circle in each corner and one solid circle in the middle. The lines are all 0.8mm wide (2 perimeters with a standard 0.4mm nozzle); the corner circles are all 8mm in diameter; and the center circle is 16mm in diameter. Cura defaults to a 0.3mm layer height for the first layer, so that is the height of this pattern.
Printing at 0.2mm (essentially 0.3mm since it's only the first layer) with a print speed of 40mm.sec, this print only takes four minutes - not including the warm up time or time spent running a leveling profile.
NOTE Due to either a Thingiverse bug or (more likely) shadowbanning, my models no longer show up under the [Newest] listings. If you want to see more of my models, please be sure to 'follow' me. If you print this, it would really help if you'd post a 'make' so that others could find this model.