Supervisor asking me to fabricate papers (and other problems) I'm seeking guidance here for a situation which is becoming unsustainable. As you can get from the title, I don't get along with my PhD (STEM) supervisor. 

He never cared of my thesis, he doesn't even read my papers at all. All he does is charging me with his ideas that every time turn out to be unsuccessful. Even worse, when an idea of his turns out to be unfeasible, he asks me to fabricate the results (and by fabrication I mean totally invented works). This has become systematic. 

For a good part of my PhD I cut him of from my activity, I almost finished my thesis and I published 6 first-author papers, 5 non-first-author papers and about 10 conference papers (I'm not including bogus works in the count).

The problem is that I'm starting an abroad period at another university and I need his recommendation. It goes without saying that he started again with his unethical and time-wasting requests.

After my abroad period, I'll come back some months (six) and finish my PhD. After that I'd like to apply for a postoc in that university. 

My question is, if I prove myself during the abroad period, would I still need his recommendation for a postdoc application? Mind that I also have a second advisor for that, in case.

In the six months between my abroad period and the thesis defense I'll be again at his will, so this mean again losing times at crazy ideas and faking papers. I need to dump him as soon as I can. Will I need him for a postdoc, if they already know me at the place where I want to apply?
Never ever fabricate. I repeat: never ever fabricate. 

If you do not manage to get a suitable reference from your superviser, your career may or may not take a nosedive, depending how lucky you are to find someone else to write you  recommendations.

But if you fabricate, you will be found out if your research is of any relevance whatsoever (and if it is not, why do this research in the first place?) and then your career, sooner or later, will be destroyed with no hope of recovery.

Addendum: in my personal opinion, the two capital crimes in science are plagiarism and fabrication. But, in my very personal opinion, fabrication is the worse of the two, because it wastes many people's time and effort in trying to reproduce the results.