... for considering to contribute directly! By building, using, posting, and talking about Hangprinter, you're already doing what the Hangprinter Project is all about.
The maintainers are super grateful if you make a merge request, and submit it to the repo. See for example here for help with doing that.
I've made a guide for how to contribute changes to hangprinter.org itself: here.
Lead developer tobben has a Github Sponsors campaign 💖. This is the most effective way to donate since it has no transaction fees.
All kinds of donations via Brave Browser are enabled.
Bitcoin donations are accepted on: 1BwobkC5Tb7psWkzCugtcH21ufj6Lc9mgY