Awesome

3D Printable Cartidge Shell for the Mega Duck Console

The Mega Duck / Cougar Boy is a (1993) hardware clone of the Game Boy with some register changes and a different cartridge format.

Until now there have been no aftermarket Cartridge Shells available for the Mega Duck. This 3D printable design can be used to avoid harvesting OEM shells for use with Flash Cartridge PCBs.

Picture of Several 3D Printed Mega Duck Cart Shells with OEM and Inside Gadgets Circuit Boards installed

Features:

Compatible with OEM and Inside Gadgets Mega Duck cartidge PCBs
Opens easily and parts remain aligned without screws for easier programming access during development
Screws can be used to lock the top and bottom parts together

3D Printing and Design

The design has been printed with success in PLA.

Use the .stl files for printing (See Releases or Thingiverse)
Use the .FCStd files for modifying the design (FreeCAD 20.1)

This was my first design using FreeCAD so there are things which should be done differently, but which I'm not going to go back and fix for now (such as fillets mixed in, instead of all last).

GBXCart Programming Jig

An improved adapter jig for programming the Inside Gadgets cartridge with a gbxcart is also included in this repo.

Picture of Inside Gadgets Mega Duck cartridge PCB plugged into a gbxcart using the 3D printed adapter jig

Screws

To avoid scratching the inside of the cartridge slot use screws with a pan head of ~1.2mm or less (so they fit completely within the screw hole recesses). Depending on the fidelity of the 3D print it may be necessary to slightly ream out the screw holes.

Compatible screws:

#21534 at MetricScrews.us
- M1.7x3 Steel / Nickel Pan Head Phillips Machine Screw, Pan Head Height & Diameter: 1.1mm, 3.2mm
#20612 at MetricScrews.us
- M1.7-0.35 x 3.5mm C1018 / Steel / Nickel Pan Head Phillips Machine Screw, Pan Head Height & Diameter: 1.1mm, 3.2mm

Available Flash Carts

Inside Gadgets

Inside Gadgets sells a 32K Mega Duck flash cart with RAM and no MBC (~$9). It can be used with this cartridge shell design.

Has a Game Boy cartridge connector on the other end so that it can be programmed with the a gbxcart.
Cartridge: https://shop.insidegadgets.com/product/megaduck-32kb-flash-cart/
GBXCart programmer: https://www.gbxcart.com/

a2heaven

a2heaven.com sells a Multi-Cart (~$66) which comes in ready made shell, so no 3D Printed shell is required. http://www.a2heaven.com/webshop/index.php?rt=product/product&product_id=172

Development Tools

As of GBDK-2020 4.0.6 it is now possible to write software for the Mega Duck in C.