Application of 3D Printing Technology using Polylactic Acid Filament for Innovative Below-Knee Prosthetic Leg

Abstract

          In this research, an innovative design and fabrication of below-knee prosthetics using 3D printing technology was presented. This research studies Polylactic acid (PLA) fibers as a material for printing below-knee prosthetics. In addition, mechanical properties were analyzed using the finite element method of below-knee prosthetics. In computer modeling of the below-knee prosthetics, the Young's modulus was measured to be 0.2767 × 10¹⁰ N/m² and the deformation rate of the below-the-knee prostheses was measured to be 6.47 × 10-5 mm. /N. The results of the study of the below-knee prosthetics model testing were based on the modulus value and it was seen that it was strong enough for applying pressure to the below knee prosthetics. For computer modeling, when subjected to a force of 100 – 1,200 N the results of the analysis using the finite element method did not find any damage to the model, and the results of the study of the deformation of the below-knee prosthetics structure were in low rate when subjected to force. For the process of using 3D printing technology to print a 5-piece prosthetic leg, the total printing time is 36 - 48 hours, depending on the printing resolution and 3D printing technology model. This research has seen the importance of using 3D printing technology in the process of printing below-knee prosthetics because it will reduce the process of making below-knee prosthetics by not having to cast a mold from a disabled person, which There are many steps in the process of making a prosthetic leg. This research also reduces the cost of producing below-the-knee prostheses by using polylactic acid fibers for printing with a material cost of only 125 - 200 baht/piece, accounting for the total average weight of the below-knee prostheses. It will be 0.25- kg. It is a cheap material cost and is lightweight and suitable for use by disabled people. This research is therefore important for developing the potential of people with disabilities by using 3D printing technology to use it in designs suitable for the use of people with disabilities.