Test pattern I designed for my Creality Ender 3 v2 Neo to check if the bed is level. It's size is 200x200 (mm) so it should work for any ender 3 or similar size printer.

After you slice it, check these important things:

• If there is a purge line, it does NOT collide with the model (in Cura, save the gcode and then open it in a new instance to see the purge line, but don't close the first one so you can change things) (Cura is weird)
• It is 1 layer high and 1 line thick (see pictures). If not, set the line width to 0.5 and the layer height to 0.2, that's the dimensions of each line in the model.

If you like this or find it useful, please press the ❤ button, I am new to this and the support helps a lot.

Designed with Onshape. Step file included.