Did you find a solution?
One way to make an additional move of an axes, is to use G92, like: G92 Y0 - them move -20 in Y direction: G1 Y-20
You could put the following two lines end code in your print file,
G92 Y0
G1 Y-20
so at the end of a print, there would be the added movement of -20mm in the Y-direction.
Likewise you could start all your prints with code, that would first send the print head -20mm in the Y direction.
One way to make an additional move of an axes, is to use G92, like: G92 Y0 - them move -20 in Y direction: G1 Y-20
You could put the following two lines end code in your print file,
G92 Y0
G1 Y-20
so at the end of a print, there would be the added movement of -20mm in the Y-direction.
Likewise you could start all your prints with code, that would first send the print head -20mm in the Y direction.