replaced the poly fuses with blade fuses from radio shack. i cant believe the difference. The bed used to take 45 minutes to heat. heats in under a minute now. Hotend us more consistent as well.Added my SD ramps thst ive had since christmas as well. yay
what fuses are in the blade adaptor(s)?
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Esos fusibles son como los de mi moto eléctrica, jajajaja!
And people wonder why I hate PTC fuses. 
45 minutes? Then I’d say you have/had problems other than the polyfuses, if they worked as designed and I make the assumption that it is a standard PCB bed with some insulation below.
Still a good idea to swap them for fuses with similar current rating of course.
The problem with heated beds is that while they all look the same, the track width tolerances are enough to change the current draw from anything as low as 7.5 amps to about 13 amps. Given the PTC fuses are 11A, and take 20 seconds to trip, you can get some weird effects.
No this is on @korpx this is one of the 12x12 silicone matt’s from qu-bd
They are the mini automotive blade style fuses.
You might want to add more conductors to those power traces on the RAMPS board. They are pretty small. The PTC was approximately rated for the size of those traces and MOSFETs. You should jump an extra wire for each of those paths. And possibly change the power MOSFETs to something with a lower Rds-on. Otherwise, it may not be able to trip the fuses and end up burning the MOSFET instead.
Im actually not usimg the current really. This is driving an ssr now. lots of changes at once.