Experimental spectra line drive (failed)

Testing of a drive method for 3D printer with spectra line.
Grooves in drive pulley are parallel as is the idler roller grooves, the idea is that the angle of line going to the drive will never change no matter where how far its "wound" up.
Normally if just wrap the pulley it will act like a screw and cause the line to climb or lower on the pulley.
I did not get any photos of it but I did also try crossing the wraps between the drive and idler roller to slightly boost the contact area on the