NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Effects of Environmental Temperature and Humidity on the Geometry and Strength of Polycarbonate Specimens Prepared by Fused Filament Fabrication
Published
Author(s)
Lichen Fang, Yan Yishu, Ojaswi Agarwal, shengyu Yao, Jonathan Seppala, Sung Hoon Kang
Abstract
It is widely known that the printing quality of fused filament fabrication (FFF) is heavily affected by environmental temperature and humidity, as the case of warping and porosity. However, there is little understanding about the quantitative relations between environmental conditions and geometry and mechanical properties of printed parts. In this study, we have systematically investigated those relations using bisphenol A polycarbonate as a model material system. For the environmental temperature, in-situ infrared imaging analysis revealed the presence of up to 5.4 °C/mm thermal gradient when printing using an open-chamber printer and a heated build plate. For the environmental humidity, analysis of X-ray micro-computed tomography (micro-CT) scans showed up to 11.7 % porosity, which is brought by polymer water content absorbed from environmental moisture. Meanwhile, tensile tests showed the mechanical performance loss associated with those defects, but surprisingly the transverse direction ductility may increase at higher porosity. Furthermore, the experimental results are combined with analytical and parametrical studies to elucidate quantitative relations between environmental conditions and printing quality. Based on the results, quantitative guidelines for estimation of printing quality based on environmental conditions are provided, which would also help users to obtain desired printing results with a better understanding of the effects of environmental conditions.
Fang, L.
, Yishu, Y.
, Agarwal, O.
, Yao, S.
, Seppala, J.
and Kang, S.
(2020),
Effects of Environmental Temperature and Humidity on the Geometry and Strength of Polycarbonate Specimens Prepared by Fused Filament Fabrication, Materials
(Accessed October 9, 2025)