You will need to reprint the last section`s frame and add fan, shaft and gears.
You will also need a metric M3 bolt 25-30 mm long to use as an axis for the fan.
There is also 120 degree camshaft arm included in case you decide to make a strandbeest with 6 pairs of legs as per original design by Theo Jansen.
Print all parts in PLA
0.2 mm layer height, 2 perimeters, 20% infill, no supports
Sand well the gear`s upper faces in order to remove all possible plastic blobs left after printing.
You may o may not sand fan blades in order to have perfectly smooth surfaces.