A1/A1mini timelaps

This is a simple marker to improve detection when using the a1Timelapse app (https://chubarevgeniy.github.io/a1Timelapse/). Simply record a timelapse video with your phone. A setting of 15x speed at 30 fps works perfectly for me (only 2-3 frames of the printhead parked in the far-left position are needed for successful detection).