simple model that contains small hexagonal shapes that are placed where the printer nozzle touches the bed during manual leveling. After the bed is leveled, the user can print this test model, and if any issues are noticed, such as the first layer being too high or low, you can initiate manual bed leveling, and the nozzle will be aligned with the center of each hexagon without crashing in to print and adjust Z manualy. This will ensure that the first layer of subsequent prints adheres properly and is of good quality.i use only 3 perimeters, zero top solid and bottom layers and one skirt line with 0 distance. works perfectly. only issue is upload here gcod file so i upload 3mf with my config. happy printing 

UPDATE: i add version 2 that have all pieces interconnected for easier cleaning print bed after