The Self aligning gear which I ordered threw Igus arrived and look great, despite the thin wall warnings. Unlike the original Bondtech gears which feature straight tooth, these are actually shaped according to 0.5 module standard. Therefore the characteristic clicking (ie Backlash) is almost completely gone. 

One problem which remains is the fixture on the steel rod. I planned to use heat inserts, but the material is so slippery that they just fall threw. So I glued the heat inserts into the gear. That worked but i don´t really like it, so I´m currently in contact with Igus about best practizes. So there will be a new version of custom gears as soon as I got more Info.