I needed another corded mouse and this time around I thought of @PKL@mastodon.social and @pronk@mastodon.social instead of Logitech's shareholders. These guys make open source mice among other open source hardware under the brand Ploopy. You can order one from them, assembled or as a kit, or you could print and build it entirely by yourself.
The mouse itself is pretty great. Coming from a long line of Logitech (MX518/G5/G500/G502), it's a bit larger than what I'm used to but I think I'm getting accustomed to it.
Here's another shot of it:
"These jokers" are giving the files and documentation away for free. They're charging for the cost of putting together a kit so you can build one without thinking or understanding anything. If you want it for cheap, self source and DIY, that's the whole point, that's why the files are free.