I know this is an old idea, but in order to use all toothless idlers, I have twisted belt between the motor and the first outer idler.
[attachment 111141 IMG_0592_sml.jpg]
I did this on the large printer (600x450) which uses 10mm belts. It did improve print quality by getting rid of repeating artifacts on the surface.
[attachment 111142 IMG_0603_ba.jpg]
At the same time twist in the belt have increased the elasticity of the belt and added to ringing/ghosting especially on X.
[attachment 111141 IMG_0592_sml.jpg]
I did this on the large printer (600x450) which uses 10mm belts. It did improve print quality by getting rid of repeating artifacts on the surface.
[attachment 111142 IMG_0603_ba.jpg]
At the same time twist in the belt have increased the elasticity of the belt and added to ringing/ghosting especially on X.