I’m gonna be honest dude. The “shorts is just over-sexualised jailbait” is a you issue, and more of a self report on the shit you watch, or you being hyperbolic. I often watch shorts and have not once ever seen anything remotely as you describe.
You get served kid videos because you watch them, which is sick of you. It’s wild you’d admit that when common knowledge is algos show you content you seem to like.
For very basic model making, try tinkercad, it runs in your browser and gives you some basic controls to make objects.
Knowing what printer you have might allow others to give you advice, some printers behave differently than others in terms of hardware and system software.
Good luck