Test discs to set/evaluate first layer - initial layer flow ratio

From top left corner - left to right for each row going down

First Layer Flow Ratio Values are:

Top/Back Row .75 .77 .80

Middle Row. .82 .85. .88

Bottom/Front Row. .90. .92. .95

Watch while printing. Too little extrusion will result in noticeable gaps in layer lines. Over-extrusion will result in excess filament along top layer.

Evaluate bottom of disks for smooth/even pattern of PEI plate - eliminate ones that show signs of layer lines.

Set your initial layer flow ratio to value of disc that produces the best result.