bed level
thingiverse
bed level adjustment for the 3rd point https://www.youtube.com/watch?v=gKQFpsmok-U
Download Model from thingiverse
With this file you will be able to print bed level with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on bed level.