---
title: "General Motors: Vapor Smoothing in Production | AMT PostPro"
description: "GM needed 60,000 spoiler closeout seals quickly: HP MJF parts in BASF Ultrasint TPU01 from GKN Additive, finished with AMT PostPro vapor smoothing."
canonical: https://amtechnologies.com/resources/case-studies/basf-ultrasint-tpu01/
updated: 2026-10-06
type: case-study
---
Case study · Automotive & motorsport

# General Motors: vapor smoothing for automotive production

General Motors added a spoiler closeout seal to its 2022 full-size SUVs to improve aerodynamics and fuel efficiency, but the design change came late.

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

Published Jan 23, 2023 Free download, no form

![An SUV rear spoiler assembly displayed on scaffolding at a trade show](https://amtechnologies.com/img/resources/cs-gm-800.webp)

Photo · A spoiler assembly from the GM program on show.

- **Customer**: General Motors
- **With**: GKN Additive (Forecast 3D), BASF Forward AM, HP
- **Industry**: [Automotive & motorsport](https://amtechnologies.com/industries/automotive/)
- **Application**: Spoiler closeout seals for 2022 full-size SUVs
- **Printing**: HP Multi Jet Fusion
- **Material**: BASF Ultrasint TPU01
- **Finishing**: [PostPro vapor smoothing](https://amtechnologies.com/products/vapor-smoothing/)
- **Published**: Jan 23, 2023

## A late design change

GM needed 60,000 parts made quickly or risk delaying the delivery of 30,000 vehicles to dealerships.[1] Its additive manufacturing team recommended HP Multi Jet Fusion, which produced a 3D-printed sample comparable to its injection-molded counterpart in function and appearance.

## The supply chain

GM selected GKN Additive (Forecast 3D), which had supplied 3D-printed parts to GM before, either directly or through a tier-one supplier. Two more suppliers completed the chain: BASF Forward AM with Ultrasint TPU01 thermoplastic polyurethane powder, and AMT with [PostPro vapor smoothing](https://amtechnologies.com/products/vapor-smoothing/) for the finish.[1]

Results

- 60,000 parts needed quickly[1]
- 30,000 vehicle deliveries at stake[1]

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_GM_AUTOMOTIVE.pdf?ver=2)

Related

- [PostPro vapor smoothing](https://amtechnologies.com/products/vapor-smoothing/)
- [Automotive & motorsport applications](https://amtechnologies.com/industries/automotive/)
- [All case studies](https://amtechnologies.com/resources/case-studies/)

General Motors on video

## Watch the story

Nothing loads from YouTube until you press play.

[Watch on YouTube:](https://www.youtube.com/watch?v=YCtoCJFK7fk)

Footage · Apr 22, 2025 Length 3:21

### _How General Motors Scaled 3D Printing with Vapor Smoothing | AMT PostPro Case Study_

General Motors' spoiler closeout seals: HP MJF parts in TPU, vapor smoothed on a PostPro SF100 to seal them and give them rubber-like properties.

[Watch on YouTube (opens in a new tab)](https://www.youtube.com/watch?v=YCtoCJFK7fk)

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[2]

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

## Sources

1. [GM's success: vapor smoothing for automotive production (spoiler closeout seal case study)](https://amtechnologies.com/resources/case-studies/basf-ultrasint-tpu01/) · AMT · Jan 23, 2023 · also [AMT](https://amtechnologies.com/industries/automotive/) · also [Forward AM](https://forward-am.com/gain-knowledge/blog/additive-manufacturing-gets-cars-into-showrooms/)
2. [PostPro benchmarking: send us your 3D printed parts](https://benchmarking.amtechnologies.com/) · AMT · read Oct 6, 2026