I've added a kapton foil heater to the glass bed on a couple of builds but you need a larger psu that won't then fit in the machine. I use an external 12A supply and a 160W heater. If you can find/print suitable spools for the steppers you could use Spectra . The top idler won't need changing as the two bearings sandwiched together will be fine. You would need to alter the rod carriers to facilitate fixing the Spectra as they are designed for belts but that may be as easy as tying the line to an M3 screw and using the existing fitment. Good luck. Pictures please if you build it :)
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