Start off with less pricy but more manual means if your looking to do some crafy stuff. Hand carved and polished pieces from some shop wood or such have potential if you put them up on a site like Etsy.

Some libraries will have 3d printers that can be used for printing the odd thing.

Look to see if there are any "maker spaces" near you (although they are more like to charge for access)

You may be able to get a cheap second hand printer on various second hand sites.

Realistically - get a job, that's how everyone else affords this stuff 🤷‍♂️ (not sure how old you are - you may be able to persuade your parents to get you a cheap printer if your interested in 3d modeling etc)

items require currency to acquire

jobs will provide you with currency

Comgrow has Amazon returns printers for $69. There are no returns and may be missing a part or two (mine was missing belts and the bed), but if you plan to tinker anyway, the parts are not terribly expensive.

That said, it definitely requires money. You'll still need filament, at the least. You're not going to get into 3d printing for free. Try to get a part-time job. Since it's the summer, ask neighbors to mow their yards for money.

Used/Returned Ender 3

who is yet to get a job and would rather do something like a sidehustle

Unfortunately you're going to be asking this question for most luxury goods if you don't get a job. Side hustles are nice, but they're called side hustles because you do them on the side, in addition to your job. I mean if you can sustain your standard of living with a hustle, then by all means, more power to you. Most people can't.

Get a job and work for it.

Before I was old enough to drive, I mowed lawns and chopped firewood for extra money.

Maybe see if there's a library or maker space near you with one?

You would also need a computer with your 3d printer as you just don't feed printer with files from internet. (Actually, they are a few case where you can but it is very limited). As for your question: To save money, you need to earn money...