Despite numerous benefits, commercialization of poly(L-lactide) (PLLA) is limited due to its low melt-viscosity and poor crystallization kinetics. This work demonstrates that the production of self-reinforced PLLA by a cost-effective, single-step Spunbond process, can overcome these limitations. Herein, poly(D-lactide) (PDLA) and PLLA were melt-blended to form stereocomplex (SC) crystallites that were drawn using blown air. Morphological observations illustrated that upon stretching, the SC crystallites were no longer visible owing to their high compatibility with the matrix but were detectable by calorimetry. Furthermore, rheological analysis revealed the polymorphic nature of network structures in blends after stretching. Interestingly, blend crystallization kinetics and rheological response were greatly enhanced at low PDLA concentrations, after the application of extensional flow. Slight improvements in tensile modulus were also achieved upon stretching. Hence, the use of a strong extensional flow during cooling effectively reduces the amount of PDLA needed to enhance PLLA’s bulk properties, without compromising PLA’s biodegradability.