[AstralStorm]

The 3D printer repair one seemed like a straightforward small business. However it is a very small or local market - hobbyists tend to know how to fix them on their own and big businesses get support plans from manufacturers. Not impossible though.

The bloom app could be either improved or even pivoted. Quite promising, but unless it becomes a real business or is really the best of is class it can easily be cloned and undercut.

The "smart" watch of this kind litters the Kickstarter for example... and it is too nerdy to scale.

Others are random hacks. :)

[LastZactionHero]

Rentals (not repairs), to be clear, but man were they heavy to ship. I did have a few rentals to bigger companies (Google, Samsung), sometimes it's easier for them to rent.

Yeah, most of them are random hacks. I don't mean to imply they were all intended to be businesses, though some were. More just meaning I have a lack of direction and haven't produced much of real value, despite thinking I was. After ten years, you realize the code and time spent starts to pile up.