Is there a fixed supply of bitcoins around the wolrd or is it printable like $?
There is not a fixed supply...yet. However, it's not printable...it's minable.
There will only ever by 21 million bitcoins created, mined. And we will not have mined them all until 2120-2140. The exact date depends on transaction volume between now and then.
After that no new bitcoin will ever be mined.
According to some sources 16 million of the bitcoin are mined and only 5 million are left to be mine till 2140. It's more than a century to mine such a low number of bitcoin which is totally disappointing for the miners and people associated to bitcoin mining. This is I guess the reason for most of the miners switched their hash power to BCH.
I think this is insane if mining bitcoin is become so difficult and expensive. I hope the technology will definitely improve to mine bitcoin and may be then all the available bitcoin may get mined till 2040.