Inefficient Force Generation in 3-D Printed Prosthetics


  • Morgan Ashley Thomas University of Florida
  • Stephen Hugo Arce University of Florida



Undergraduate Research


The process of 3-d printing prosthetic hands has been used to make prosthetics more widely available by lowering the cost. However, many of these devices are not mechanically tested once they are constructed and they may not achieve their intended function. This study quantifies the efficiency and magnitude of mechanically activated grip strength in a 3-d printed prosthetic hand. A rig stabilized the hand on a dynamometer at an angle such that added weight created a constant downward force and engaged the grip. We tested the hypothesis that the presence of the hand would act as a friction device and propagate less force on the dynamometer when engaged than weights alone. The results supported the hypothesis and can aid in classifying the function of the hand for certain tasks such as holding a cup. This study can inform new designs to improve the efficiency of grip strength in similar devices. Furthermore, quantitative data on the strength of the fingers can better inform how custom hand devices will be suited to specific tasks.

Author Biography

Stephen Hugo Arce, University of Florida

Primary Faculty and Lecturer in the Biomedical Engineering Department


A. (2018, March 17). About Us. Retrieved April 16, 2018, from

A. (2016, October 18). Alex - Limbitless Solutions - Creating Hope with 3D Printed Limbs. Retrieved April 16, 2018, from

ABOUT US. (2017, October 01). Retrieved April 11, 2018, from

Arce, S. H. (2018, February 03). Functionality of Prosthetic Devices [Personal interview].

Dougherty, D. (2016). Free to Make. Retrieved April 16, 2018, from

Henry, J. C. (2016, December 22). 'Determined' teen drummer receives prosthetic arms. Retrieved April 16, 2018, from

I. (2017, October 11). Assembly of E-NABLE's Raptor Reloaded Hand. Retrieved April 10, 2018, from

LimbForge. (2017). Retrieved April 16, 2018, from

T. (n.d.). Thingiverse - Digital Designs for Physical Objects. Retrieved April 16, 2018, from

Raptor Reloaded by e-NABLE [STL]. (2014, December 17). E- Walker, J.,

Halliday, D., & Resnick, R. (2011). Fundamentals of Physics (9th ed.). Hoboken, NJ: Wiley.