Fits into a normal Dummy13 V1.0 into the same back slot as the backpack.
Orient it with the nozzle-end of the rocket sitting on the print surface. Use supports.
Optional:
.15mm layer height
Color change on layer 33 and 167.
I also put fuzzy skin on some of the surfaces between the two rockets.
The author remixed this model.
This model is almost entirely new, I only copied the connector from the original backpack.