Note: There were quite a few collisions in LDD, most are recognisable as to where parts go. Included in the package are a series of photos showing where each should be placed:) I recommend using the file with the modules "Spirograph V2 Parts" and then assembling as shown in the other file.
All that is left up to you is your choice of pen and battery box. I find BIC four colours provide a crisp line.
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Use LEGO Digital Designer to open these files and generate step by step building instructions.