A PDF is enough to start. Send what you have:
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PDF is enough to start. SolidWorks drawings (.SLDDRW) are fine too. Combined with the model, stay under 8MB.
STEP, STP, Parasolid (.x_t), IGES, DWG, DXF, or SolidWorks Part (.SLDPRT). Large files may exceed the 8MB total limit.
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