The BfB kit (v2.0.1) has starshaped Z-Flanges. Material economics outweighed the construction requirements here. In my case the toothed belt realigns in continuous flip-flopping along the flange fingers and occasionally runs off from the gear.
I replaced these with full flanges cut from 5mm acrylic. With help of the FabLab and their Lasercutter. Now the belt runs much more smooth and does not roll off anymore.
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