“…Moreover, polymer composites containing hydroxypropyl cellulose have a high potential to fabricate 3D-printed medicines, as there have been a number of published articles [ 24 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ]. Therefore, the present study aimed to investigate the rheological properties in terms of viscosity, shear-thinning behavior and viscoelastic properties of 17 hydroxypropyl cellulose-based mixtures, which were successfully printed in the form of immediate and controlled release delivery systems [ 25 , 26 ]. Additional polymers (Soluplus ® , Kollidon ® VA 64 or Eudragit ® EPO, RS or RL) and/or disintegrants (sodium starch glycolate, microcrystalline cellulose, croscarmellose sodium, crospovidone or low substituted hydroxypropyl cellulose) were combined into the feedstock filament at various ratios, as presented in Table 1 .…”