Bambu Lab A1 build plate aligner with brush support. You will need 2x m3 screws with flat head to secure them. Also use some heat resistant material for 3d print (ex. ABS) because PLA will melt fast. 

You should also disable nozzle clamping detection and build plate position detection in printer settings→print options. Also disable nozzle clog detection feature (is useless as for me) in the slicer settings to use this mod. Just remove this piece from timelapse gcode 

Upd. After testing it for some time I have found that the brush support is useless. So I have added v2 without it.