Here are some Legs for a CR-10 or any other 4020 extrusion base.  I have included legs for 2020 extrusion if you want the extra support for the front and back.  There are no screws needed!

You will need to rearrange the wires and attach the bed wire to keep it from getting stuck on the back corner. 

I printed mine on an Elegoo Neptune 4 max and sliced it with Orca Slicer with the following settings.

Layer Height: 0.24 mm

Walls/Perimeters: 2

Make overhangs Printable: On

Infill density: 10%

Infill pattern: Cubic

All other settings were standard.

When you import the objects into your slicer you will need to orient them upright.