This design was inspired by the Sega Game Gear, and closely matches its size in both overall dimensions, and screen size. The idea was to make a better version of the pigrrl 2 that was not so uncomfortable to hold, has increased battery capacity, available hdmi for dual viewing, and eliminated the awful speaker hum that the pigrrl 2 had. This desing incorporates a teensy for the controls so you have true analog for the joystick instead of a dpad function like other project. basically i took all the features i liked from other project, took out the ones i didnt, and added what i thought should be there. This design does allow you to use a set of pcb's i designed, and can be purchased rather cheap ($5) for both boards. I look forward to more designs in the future, and i hope that this one being released freely increases the interest in it. The pics dont show the tft buttons in place, but the files are provided, and there are 2 types of dpad given i had trouble printing the ones without the hole in the center.
The other items you will need are as follows:
1x - Raspberry Pi 3 - Model B
1x - Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302
1x - Breadboard-friendly SPDT Slide Switch (check measurements before ordering, i use non standard switches)
1x - Lithium Ion Polymer Battery - 3.7v 2500mAh (cylinder type, look like AA)
2x - Mini Metal Speaker w/ Wires - 8 ohm 0.5W
1x - PowerBoost 1000 Charger (500 will work with using a smaller screw)
1x - 16GB sandisk or samsung class 10 SD/MicroSD Memory Card with retropie/attract front end (link can be provided for a download because its real tricky getting the lcd to work)
1x - 3.2in TFT lcd for raspberry pi (cheap ebay ones work for the most part)
6x - 6mm Tactile Button switches
6x - 12mm Tactile Button switches (the kind with a keycap that is removable)
10x - #4-40 3/8 machine screws
4x - #2-56 3/8 machine sccrews
1x - ribbon cable to cut up for jumper wire connections, and possibly 22 gauge for connecting the analog stick
speed for first layer was 40mm/sec and the rest was 60-80mm/sec. My printer runs real hot so i cant recommend a temp.