--- title: "Vapor Smoothing Industrial FDM Parts | AMT PostPro" description: "Which FDM parts PostPro can vapor smooth: ULTEM and Onyx with PostPro Pure, and ABS, PC, PBT, ASA and PET with FA326 on the SF50 and SF100." canonical: https://amtechnologies.com/learn/fdm-vapor-smoothing/ updated: 2026-10-07 type: learn --- Learn · Industrial FDM # Vapor smoothing for industrial FDM parts. FDM vapor smoothing reflows the layer ridges and gaps of an extrusion-printed part into a smoother, closed surface. PostPro handles industrial FDM materials as AMT lists them: ULTEM and Onyx with PostPro Pure, and ABS, PC, PBT, ASA and PET with FA326 on the SF50 and SF100.[1,2] [Test your parts, free](https://benchmarking.amtechnologies.com/submit?utm_source=amtechnologies.com&utm_medium=learn-page&utm_campaign=site-2026&utm_content=fdm-fdm-hero) [Get a price](https://amtechnologies.com/configurator/) No cost to evaluate · Parts returned · Typical turnaround 2–3 weeks[3] Printing process - **With PostPro Pure**: ULTEM · Onyx[2] - Every PostPro system - **With FA326**: ABS · PC · PBT · ASA · PET[1] - SF50 and SF100 Why FDM parts need finishing ## Layer lines are more than looks. Extrusion printing builds parts from beads of molten plastic. The ridges between beads show, catch dirt and, where beads do not fully bond, leave gaps that let liquids in. 1. ### Layer ridges Reflowing the surface softens the ridges between beads for a cleaner, more even look. 2. ### Closed gaps A reflowed skin closes small gaps between beads at the surface. 3. ### High-performance materials ULTEM and carbon-filled Onyx parts go into demanding uses; PostPro Pure handles both.[2] 4. ### Controlled, not improvised A closed machine with a recipe, instead of an open jar of solvent. Materials ## FDM materials by finishing agent. As AMT lists them. If your filament is not here, send a sample. **FDM materials by finishing agent** | Material | PostPro Pure | FA326 | FA9202 | | --- | --- | --- | --- | | ABS, PC, PBT, ASA, PET[1] | Not listed | Listed | Not listed | | Ultem[1] | Listed | Not listed | Not listed | | Onyx (carbon-filled nylon)[2,4,5] | Listed | Listed | Not listed | Acetone at home vs industrial ## Same idea, different process. Hobbyists smooth ABS prints with acetone vapor in a jar or a heated box. It can look good on a single part, but nothing is controlled and the solvent escapes into the room. ### Acetone smoothing Time, temperature and vapor concentration drift; thin features and edges can slump; results vary from part to part; the operator breathes and handles the solvent. ### PostPro vapor smoothing An automated cycle of Conditioning · processing · curing · drying[6] in a closed chamber. On the SF50 and SF100: Closed-loop system with consumable recovery[6]. [How to smooth 3D prints: the full guide](https://amtechnologies.com/learn/how-to-smooth-3d-prints/) Questions ## FDM vapor smoothing: questions. Short answers from AMT’s published material lists. Anything else, [ask an engineer](https://share.hsforms.com/1lOH82JpuRdSM-4wJ1ZeYlw45o6d?website_source=Vapor+Smoothing&utm_source=amtechnologies.com&utm_medium=learn-page&utm_campaign=site-2026&utm_content=fdm-talk). ### Which FDM materials can PostPro vapor smooth? As AMT lists them: ULTEM and Onyx with PostPro Pure, and ABS, PC, PBT, ASA and PET with FA326 on the SF50 and SF100.[1] For other filaments, send a sample. ### Can the desktop SFX smooth FDM parts? Yes, for the FDM materials listed with PostPro Pure, such as ULTEM and Onyx. The SFX covers MJF, SLS, SAF, HSS; FDM (including ULTEM and Onyx)[4,6]. ### How is industrial vapor smoothing different from acetone smoothing at home? It is the same principle run as a controlled machine process: a recipe, a closed chamber and recovery of the finishing agent, instead of an open container of acetone. Next step ## See the price. Run the numbers. Hold the part. List prices are public and the cost-per-part math is yours to check, with no email needed for either. The free benchmark puts your own parts, vapor smoothed, in your hands. 1. 01 Quote ### Build your quote Pick a system and its options and get an itemized total on screen, from AMT’s published list prices. [Build your quote](https://amtechnologies.com/quote/) 2. 02 ROI ### Calculate your ROI Compare your cost per part with manual finishing, using your own labor rate and volumes. Every assumption is editable. [Calculate ROI](https://amtechnologies.com/roi/) 3. 03 Benchmark ### Test your parts, free Ship us your parts with a prepaid label. We vapor smooth them and send them back with before-and-after photos and a benchmark report. [Test your parts, free](https://benchmarking.amtechnologies.com/submit?utm_source=amtechnologies.com&utm_medium=learn-page&utm_campaign=site-2026&utm_content=fdm-decision) No cost to evaluate · Parts returned · Typical turnaround 2–3 weeks[3] Prices: AMT list prices, excluding tax and shipping; confirmed in your formal quote. [Not sure which system? Help me choose](https://amtechnologies.com/configurator/) ## Sources 1. [AMT PostPro brochure: automated post-processing systems for additive manufacturing, V4.0 (June 2026)](https://info.amtechnologies.com/download-document?document_name=brochure) · AMT · Jun 2026 2. [Vapor smoothing consumables: PostPro Pure (FA5802), FA326 and FA9202](https://amtechnologies.com/products/vapor-smoothing/consumables/) · AMT · read Oct 6, 2026 3. [PostPro benchmarking: send us your 3D printed parts](https://benchmarking.amtechnologies.com/) · AMT · read Oct 6, 2026 4. [PostPro compatible material list: PostPro SFX, FA5802, V9.0](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Specification%20Sheets/AMT_MATERIALS_POSTPRO_SFX_EN.pdf?ver=2) · AMT · Dec 2025 5. [PostPro compatible material list: FA326, V6.1](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Specification%20Sheets/AMT_MATERIALS_POSTPRO_SF_FA326_EN.pdf?ver=2) · AMT · Apr 2025 6. [Vapor smoothing: SF and X-series family page and SFX, SF2X, SF50, SF100 product pages](https://amtechnologies.com/products/vapor-smoothing/) · AMT · read Oct 6, 2026 · also [AMT](https://amtechnologies.com/products/vapor-smoothing/postpro-sfx-desktop-vapor-smoothing-system/) · also [AMT](https://amtechnologies.com/products/vapor-smoothing/postpro-sf2x/) · also [AMT](https://amtechnologies.com/products/vapor-smoothing/postpro-sf50/) · also [AMT](https://amtechnologies.com/products/vapor-smoothing/postpro-sf100/)