SEGA Genesis 2 (US) / Megadrive 2 (EU) - Total Case Replacement

Revision Status: 3

See Here for Update Notes

Be part of the conversation

Twitter: @DVIZIX Instagram: DIVIZIX

The SEGA Neptune. Originally conceived as a Genesis and 32X system combined into a single console, it unfortunately never saw the light of day. As a massive SEGA fan, my goal is to bring this amazing system back to life by providing a replacement shell that can be swapped with a standard US or EU Genesis/Megadrive 2.

Simply unscrew your existing Genesis 2 console (preferably one that has been damaged externally) and replace the below listed parts with my new 3D printed offerings to turn your console into a Neptune!

Check out Macho Nacho Productions excellent video build:

SEGA CANCELED this console in 1995, so I made one in 2023 | SEGA Neptune

Bill of Materials:

Genesis 2 Shell Base  -  Replace with  -   DVIZIX Neptune Shell Base

Genesis 2 Shell Top  -  Replace with  -  DVIZIX Neptune Shell Top

Genesis 2 Shell Extension Slot Cover  -  Replace with  -   DVIZIX Neptune Shell Extension Slot Cover

Genesis 2 Cartridge Flap 1  -  Replace with  -   DVIZIX Neptune Cartridge Flap 1

Genesis 2 Cartridge Flap 2  -  Replace with  -   DVIZIX Neptune Cartridge Flap 2

Genesis 2 Power Button  -  Replace with  -  DVIZIX Neptune Power Button  -  And  -   DVIZIX Neptune Power Button Attachment

Genesis 2 Reset Button  -  Replace with  -  DVIZIX Neptune Reset Button  -  And  -   DVIZIX Neptune Reset Button Attachment

Genesis 2 LED Attachment  -  Replace with  -   DVIZIX Neptune Power LED Attachment Part 1 - And - Part 2

All the above listed items are required to complete the Neptune Console.

**For those that wish to perform the Genesis+32X combined mod, you will need the following items depending on the build method:

Longhorn Build - A documented process that requires a high skill level

The internal components should leave just enough room for bracket mounted dust flaps. In this case you will need to purchase this modified bracket which is a reduced version of the existing Genesis one:

DVIZIX Neptune Reduced Cartridge Flap Mount

The Modular Build - A modular approach that is less destructive and reversible

Although less destructive, the downside is the amount of space taken up by the modular components. In this case you will need to purchase this imitation dust cover which are both flaps fused together that simply rest in place:

DVIZIX Neptune Cartridge Dust Cover

*** DISCLAIMER ***

• This is a passion project designed by hobbyists for hobbyists. All dimensions have been scaled by me using an EU model Megadrive 2 and as such details and quality will depend greatly on the material chosen.
• This is designed to be a shell replacement for a Genesis/Megadrive 2 and as such will continue to function as a Genesis/Megadrive 2 only.
• Although this is designed to replicate the Neptune as can best be obtained by images and video of the prototype, the placement of ports, buttons, size and thickness of the console is still dictated by the Genesis 2’s integrated components and therefore a complete imitation of the system cannot be achieved.
• To integrate a working 32X system within this replacement shell would require the expertise of others with all the associated risks involved.
• The current revision of this Neptune shell is designed to be a replacement for the "push down" on/off button system, not the "left/right" switch action button that is used on the Japanese version.
• Please DO NOT throw away your old Genesis/Megadrive 2 shell. Any examples of these amazing old systems should be preserved and enjoyed hence my goal to create a console that is as easy to modify as it is to revert back to its original form without any destructive methods.

Any feedback would be greatly appreciated to further improve the shell design for future revisions.

Happy Modding!