This study focuses on developing a 3D-printable concrete mix by optimizing the superplasticizer dose and water-to-binder ratio while substituting 10% of marble powder waste as a cement replacement. The step-by-step methodology for achieving the optimal 3D printable material mix is outlined, encompassing the mix proportions, material fineness, and the procedures involved. Experimental investigations were carried out using a 3D Printer, including tests for flow, extrudability, and buildability to refine the printable mix and compressive strength tests were carried out. The optimal mix was achieved by adjusting the water-to-binder ratio, and superplasticizer dosage. The results show that a printable mix with 0.35% Superplasticizer dosage, 0.35 water-to-binder ratio, and 10% marble powder waste as cement replacement exhibits superior printing quality.