PHB (Polyhydroxybutyrate) is a promising biopolymer: it is 100% biobased and 100% biodegradable. However, processing of PHB, especially in fiber processes is challenging due rapid degradation, high melt adhesion, low initial crystallization rate combined with strong post-crystallization and its low stretchability. In recent research, DITF Denkendorf screened commercially available PHBs on their rheological and molecular characteristics as well as on their performance in melt blown process in technical scale. Despite of similar data sheet specifications, the study revealed large differences in minimum process temperature (up to 30 K!) and possible throughputs by process pressure limitation (max.3 kg/h/m vs. > 7 kg/h/m). The average fiber diameters varied significantly with the process parameters and could be engineered to achieve median fiber diameter of 2.4 μm, which is outstanding compared to the current state of literature. Corresponding fabric properties also open unique property constellations, such as high air permeability with zero water permeability, enabling interesting aspects compared to existing products. Use of recycled (up to 4-times) granules, blended to virgin PHB showed the potential for a succescul material cycle. Furthermore, PHB can be hydrolyzed by many aerobic and anaerobic microorganisms in soil, compost, sewage sludge, freshwater and even seawater. In addition, the DITF have developed a process step, currently still semi-automated, for the production of 3D parts as a single-stage product manufacture directly in the meltblow fiber jet, which produces dimensionally stable products. As a final challenge, the still limited elongation at break (in the range of 3 - 5%) is currently being investigated using different types of bio-based plasticizing additives.