This part allows you to see if your effector is tilting as it traverses your bed surface.
This part is very forgiving. Use whatever filament is lying around.
How to use
Clip this part to your effector with a bulldog clip. Now move the effector around so that the tilt meter is just above the surface. You should be able to watch the tips of the meter and see how much they move up and down, as you move the effector around.
If you notice the tilt changing as you move the effector around, you can space out the diagonal rods on either the effector or the carriage, to stop the tilt from changing as you move the effector around.