This is my own bed level test and filament print speed test that`s quick and easy, it is only 1 layer high.

Print takes between 12 and 25 minuets to print depending on your filament selection.
helps to see what area of your bed needs small levelling adjustments while it is printing as it repeats the same pattern 3 times on each side

Also helps adjust and test the flow, speed, temp, etc while it is printing to determine what speed/heat your filament can handle.

Let me know if you find it helpful.

Creality

Ender 3

No

No

0.16

20

Printing at a speed of 40mm/ initial layer speed 20mm/s

First Print clearly showed i had some issues with my beds level.
with it printing, I was able to adjust the level.

after correcting during the first print, i printed again and could further adjust small settings, heat adjustment, speed and flow to see what works best with my PeTG filament now that the bed was level and each corner i could adjust the heat etc to see what works best.

not much to it, just simple blocks and circles