---
title: "ERPRO: Combined Post-Processing for PA11 | AMT PostPro"
description: "AMT and ERPRO 3D Factory compared finishing routes, vapor smoothing among them, on SLS and MJF PA11 parts to reach different levels of surface finish."
canonical: https://amtechnologies.com/resources/case-studies/combining-post-processing-techniques-to-achieve-the-optimum-surface-finish/
updated: 2026-10-06
type: case-study
---
Case study · Industrial & food processing

# ERPRO: mastering surface finish with combined post-processing

Surface roughness holds back many end-use applications of 3D-printed parts, and some need more than one finishing step to reach the result they require. AMT partnered with ERPRO 3D Factory to evaluate how well different post-processing combinations reach different levels of surface finish.

[Read the full case study (PDF, opens in a new tab)](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Case%20Studies/AMT_CS_ERPRO%20OPTIMUM%20FINISH.pdf?ver=2) [Test your parts](https://amtechnologies.com/test-your-parts/)

Published Jan 23, 2023 Free download, no form

![Gray 3D-printed PA11 test parts with different surface finishes](https://amtechnologies.com/img/resources/cs-erpro-800.webp)

Photo · PA11 test parts from the study.

- **Customer**: ERPRO 3D Factory
- **Industry**: [Industrial & food processing](https://amtechnologies.com/industries/industrial/)
- **Application**: Surface finish study on PA11 parts
- **Printing**: SLS and HP Multi Jet Fusion
- **Material**: PA11
- **Finishing**: [PostPro vapor smoothing](https://amtechnologies.com/products/vapor-smoothing/)
- **Published**: Jan 23, 2023

## What was compared

The study analyzes several finishing processes, including chemical vapor smoothing, in different combinations. It measures the surface finish each route achieves on SLS- and MJF-printed PA11 parts.[PDF](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Case%20Studies/AMT_CS_ERPRO%20OPTIMUM%20FINISH.pdf?ver=2)

Download the case study for the results of each post-processing combination.

Result

Finishing routes compared on SLS and MJF PA11 parts[PDF](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Case%20Studies/AMT_CS_ERPRO%20OPTIMUM%20FINISH.pdf?ver=2)

Full case study

The complete story as a PDF. Free, no form to fill in.

[Download the PDF (opens in a new tab)](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Case%20Studies/AMT_CS_ERPRO%20OPTIMUM%20FINISH.pdf?ver=2)

Related

- [PostPro vapor smoothing](https://amtechnologies.com/products/vapor-smoothing/)
- [Industrial & food processing applications](https://amtechnologies.com/industries/industrial/)
- [All case studies](https://amtechnologies.com/resources/case-studies/)

Test your parts

## Send us a part. See it smoothed.

We vapor smooth your own parts and send them back with the results. No cost to evaluate · Parts returned · Typical turnaround 2–3 weeks[1]

[Test your parts](https://amtechnologies.com/test-your-parts/) [See the systems](https://amtechnologies.com/products/vapor-smoothing/)

## Sources

1. [PostPro benchmarking: send us your 3D printed parts](https://benchmarking.amtechnologies.com/) · AMT · read Oct 6, 2026