I need help guys, after hashinh for several days my cables at the molex splitters started melting.

See the OP again, the recommendations is NOT to use a molex connector. Plenty of links and information there.
It would power ONE. Remember you can use the 4 pin ATX mobo cable for one, and if you have am 8 pin you can power two with 2x4 pin.
Thank you for all the hard work and effort you have put in the OP. Do you think that, cutting a 6pin connector would be sufficient to power 3 blades, as a replacement for the molex?