Show HN: I built a synth for my daughter

> A 3D-printed enclosure is fine for a prototype, but a real product likely needs injection-molded parts, which require expensive tooling.

For kid-friendly toys, yes. But for older users not necessarily:

https://teenage.engineering/products/po

How are these, are they worth the money? I have seen these before, but thought they might be crappy "jokes". However, if they are decent, I would love to play around with them.

"worth the money" is hard to say, especially for devices like these where the value is not really so much on the plain features as much as a more subjective factors like the design and the UI. I would say that purely based on features - probably not, especially with post-covid pricing. There are more powerful iphone or android apps for much less. Behringer, and to some degree Korg and Roland offer lower-end devices for not much more that ultimately might be more useful and usable. But, I do own a couple of these little guys and they're fun. I wouldn't call them "jokes", but calling them "toys" - in the good and bad sense - would probably not be a stretch, even if you can get some nice sounds out of them. I used to keep a couple on my desk and just jam a little with them as a distraction.