Torpedo Model

This is a model of a generic torpedo for operating with a 500 size electric motor, although other smaller ones should be easily adapted.I have designed the parts, except the propeller, with Sketchup and then exported to STL. I have designed the propeller with jSDN and then exported to STL.

BOM
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4 x Fins (plastic, printable)
2 x Body tubes large (plastic, printable)
1 x Body tubes small (plastic, printable)
1 x Nose (plastic, printable)
1 x Engine mount (plastic, printable)
1 x Tail (plastic, printable)
4 x Coupling rings (plastic, printable)

4 x M3 40 mm screws
4 x M3 nuts
2 x M3 8 mm screws
1 x 3 mm diameter shaft
1 x 3 mm inner diameter brass tube
1 x Electric motor 500 size
1 x 7.2 V NiCad battery
1 x 25 A electric speed controller (ESC)
1 x Arduino-style programmable board

Printing
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I have used a XYZPrinting Da Vinci Jr 1.0 printer, with XYZPrinting natural PLA. The general printing parameters are:

* no need for support material or