Best way to get float formatting on a Zero


What's the best way to get printf-like float formatting in the Zero?

I tried a number of libraries and solutions, but couldn't get anything to work and I've spent almost all my day into this. I tried PrintEx (I just opened a post, as I can't compile it), I tried a number of other libraries and hacks during the day (like adding a template to get streaming working, but it didn't either), using dtostrf() (didn't work either)...

I'm at my wit's end, and I'm sure that by now, somebody might have figured it out. I'm tired, and I don't know where else to look.

I'm using the latest IDE, and using a Sodaq ONE, that has a SAMD21 micro.

Can you help me?