Today i made my GT2b much more smaller. I just glued everything together . Its not that much professionell like all the 3D Printed enclouses but it works^^. If you guys want to try this, put everything first together with zip ties and test it because u have to isolate all parts that are metal.
EDIT: Dont forget to test it and connect it before you glue it because its really hard to remove that stuff. I had a little short and accidentally broke the antenna while removing the glue with a scalpel.