Steadytech Mini 3D Printer filaments

I got my self recently my first and the cheapest 3D printer I ever seen. And yes I know that it doesn't sound very promising but you have to start somewhere.
https://www.ebay.co.uk/itm/Steadytec...e/273944975924

I noticed that it can use only PLA but why is that?
Is it just the lack of heated bed?

By the way can you safely submerge a object from PLA in a mineral oil? xD

yes mineral oil should not effect pla.

Yes the unheated bed is a problem.
But you can print all the exotic plas: wood, flexible etc. They actually stick and warp less than normal pla. I usually print flexible and wood filaments without any bed heat anyway.

Thank you.
Can you recommend me any strong PLA filament based?