This is an arcade trackball. You can print most of it, but you will also need steel rollers, a ball, and electronics (details folllow).

I've included holes in the bottom for mounting screws to attach an LED board to shine through the ball if you have a transparent/translucent ball. (For example: https://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=74&products_id=273)

If you plan to mount this under a wooden panel and like a decent amount of ball exposed, you don't need to print the top half.

When printing, bear in mind the the mounting for the optical boards is based on my own circuit board design (attached zip file). If you use a purchased board or custom, this bit needs to be modified.

For the optical board, you will need:

• 1 x 100 Ω
• 2 x 4.6k Ω
• 2 x EE-SX1041
• 1 x SN74LS14N
• 4-pin connector, 0.1" spacing

I have printed and tested (see pic above) the bottom portion, but have yet to print and test the top (I don't have a need for it, as I plan to undermount on a wooden control panel).

Additional required and optional parts can be found here:

• ball: https://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=74&products_id=274
• mounting bolts (confirm length for your purposes first): https://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=74&products_id=297 https://www.arcadeshop.com/i/205/3-trackball-carriage-bolt.htm
• rollers:Note: There are variations in these, not sure if/which of these links may be compatible with the included STL file. https://www.arcadeshop.com/i/62/3-trackball-roller-kit-atari-happ.htm https://www.arcadeshop.com/i/60/3-trackball-rebuild-kit-atari-happ.htm
• bearings (or see roller kit above): https://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=74&products_id=296 https://www.arcadeshop.com/i/11/2-3-trackball-bearing-kit-atari-happ.htm
• optical board (or DIY): https://www.arcadeshop.com/i/828/atari-happ-trackball-optic-pcb.htm
• encoder wheel - or print your own https://www.thingiverse.com/thing:7077772 https://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=74&products_id=283 https://www.arcadeshop.com/i/1704/2-3-encoder-wheel-atari-happ.htm