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Hi and thanks for responding! I'll try this. Also I found info on the Wanhao website per the link below that has a different script line (??). Here it is:
{REPLACE "\n; layer 19, Z = " "; layer 19\nG28 Y0 X0\nM300\nM25\nG92 E0\nG28 Y0 X0\n; layer 19 "}

(I'm guessing the above is for pausing at, for example, layer 19)

Here is the link, just scroll down to the info on S3D: