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I tweaked a little the OpenSCAD file to remove the line that puzzlebox_io commented.
line 260: translate ((R + R / 2-0.08) / sqrt (2) [1,1]) circle (r = R / 2);
line 261: translate ((R + R / 2-0.08) / sqrt (2) [1, -1]) circle (r = R / 2);

Also, I changed the petal_shape module to remove a small step that appeared on the display.
line 246: color ("red") translate (1.9985 R [cos (theta) sin (theta)]) circle (r = R);
line 247: color ("orange") translate (1.9985 R [- cos (theta) sin (theta)]) circle (r = R);
line 248: color ("green") translate (1.9985 R [cos (theta) - sin (theta)]) circle (r = R);
line 249: color ("blue") translate (1.9985 R [- cos (theta) - sin (theta)]) circle (r = R);

I have not yet printed it, but at least in the visualization, errors are not displayed.

Greetings

PS: This values are for a $fa=4.5, for others $fa values, lines appears in visualization.

First, emmett, great work :D

I tweaked a little the OpenSCAD file to remove the line that puzzlebox_io commented.

line 260: translate ((R + R / 2-0.08) / sqrt (2)

[1,1]) circle (r = R / 2);[1, -1]) circle (r = R / 2);line 261: translate ((R + R / 2-0.08) / sqrt (2)

Also, I changed the petal_shape module to remove a small step that appeared on the display.

line 246: color ("red") translate (1.9985

R[cos (theta) sin (theta)]) circle (r = R);line 247: color ("orange") translate (1.9985

R[- cos (theta) sin (theta)]) circle (r = R);line 248: color ("green") translate (1.9985

R[cos (theta) - sin (theta)]) circle (r = R);line 249: color ("blue") translate (1.9985

R[- cos (theta) - sin (theta)]) circle (r = R);I have not yet printed it, but at least in the visualization, errors are not displayed.

Greetings

PS: This values are for a $fa=4.5, for others $fa values, lines appears in visualization.