This document specifies test methods to determine particle emissions (including ultrafine particles) and specified Volatile Organic Compounds (including aldehydes) from desktop MEX-TRB/P processes often used in non-industrial environments such as school, homes and office spaces in an Emission Test Chamber under specified test conditions. However, these tests may not accurately predict real-world results. This document describes a conditioning method using an ETC with controlled temperature, humidity, air exchange rate, air velocity, and procedures for monitoring, storage, analysis, calculation, and reporting of emission rates. This document is intended to cover desktop MEX-TRB/P 3D printer which is typically sized for placement on a desktop, used in non-industrial places like school, home and office space. The primary purpose of this document is to quantify particle and chemical emission rates from desktop MEX-TRB/P 3D printer. However, not all possible emissions are covered by this method. Many feedstocks could reléase hazardous emissions that are not measured by the chemical detectors prescribed in this document. It is the responsibility of the user to understand the material being extruded and the potential chemical emissions. An example is Poly Vinyl Chloride feedstocks that could potentially emit chlorinated compounds, which could not be measured by the method described in this document.