This is Version 3 of the plotter attachment. As in th3 version 2, 4 M3 screws are required. Two for holding pen and 2 for holding the attachment itself. Since the part is fully made up of plastic the Version 3 contains two holes for the M3 Nuts! and so this requires 2x M3 nuts.
However, I used only 1 hole which works fine as well.
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