I've tried something similar in the past, but instead of using the string in a horizontal position, i put inside the cart material from a copper sponge.
The copper sponge is a perfect material that doesn't take much place (almost nothing) and is a perfect heating element.
Then I put the poly fiber on top of the cart as a cap, that would serve both as a retainer and as a diffuser.
But I'm still trying to improve it.
On a 510 cart, you need a thicker cap than on a 901 or 801 cart, because when it flows, it flows, and the 501
atty needs less drainage than a 901 or an 801.
It's also interesting to notice that the older the poly, the better it becomes, since the thicker it gets, thus better retention.(at least for a 501)
I really encourage anyone to try it and to improve it...I don't have much time right now to work on it, but it is worth a look.
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