Most filament imported into the United States is entered under HTS heading 3916 — monofilament of which any cross-sectional dimension exceeds 1 mm. Getting the classification, the rate and the paperwork right is the difference between a predictable landed cost and a margin surprise three weeks after the container lands.
How filament is classified
| Item | Typical classification | Notes |
|---|---|---|
| 1.75 mm / 2.85 mm / 3.00 mm filament | HTS 3916.10.00 or 3916.90.xx | Depends on the polymer family; PVC-based monofilament sits in a different subheading |
| Spools and reels | Usually classified with the goods | Packaging that is normal for retail sale generally follows the filament |
| Samples under de minimis | Section 321 | Exemption thresholds and eligibility have changed repeatedly — verify before relying on it |
Published tariff tables show a general (MFN) rate around 5.8% for 3916.10.00, plus additional Section 301 duties that have applied to many Chinese-origin plastic articles (reported at +25%). Both the headline rate and the exclusion lists are policy variables. Use a licensed customs broker to confirm the rate that applies on your entry date.
Documents your broker will ask for
- Commercial invoice with Incoterm, unit price, quantity, net/gross weight
- Packing list matching carton counts and dimensions
- Bill of lading / sea waybill
- HTS classification and country of origin declaration
- Product data: TDS and SDS (SDS is expected for chemical products in many channels)
- Compliance declarations where your channel requires them — RoHS/REACH statements, and for consumer SKUs, CPSIA and California Prop 65 documentation
Modeling landed cost properly
A quote comparison is only meaningful on identical terms. Ask every supplier for the same three: FOB, CIF to your port, and DDP to your door. Then add:
- Duty on the entered value (not on the FOB price alone — freight and insurance can be part of the customs value)
- Merchandise Processing Fee, harbour maintenance fee
- Brokerage, bond, ISF filing
- Drayage, chassis, detention if the container sits
- Receiving labor at your 3PL — filament cartons are heavy; budget the handling time
Where importers lose money
- Assuming the old rate. Tariff policy moved several times in 2025–2026. Re-check every quarter.
- Comparing DDP to FOB. A supplier's DDP number can hide a slow routing or a re-invoice later.
- Ignoring weight. At roughly 14 kg per 10 × 1 kg carton, filament containers are weight-limited. Freight quotes built on volume assumptions come out wrong.
- Thin documentation. If the SDS or declaration does not match the exact grade shipped, a customs or retail-compliance query can hold the goods.
VOXFIL ships with a document pack built for importers: TDS and SDS per grade, RoHS and REACH declarations, EU/US declarations of conformity, and lot-level batch reports with each order. See the Trust Center for the exact scope.
Frequently asked questions
What HTS code is used for 3D printer filament?
Most filament is classified under HTS heading 3916 as plastic monofilament with a cross-sectional dimension over 1 mm, commonly 3916.10.00 or a 3916.90 subheading depending on the polymer. Classification is fact-specific — confirm with a customs broker.
Is there a duty on Chinese filament in 2026?
Chinese-origin goods have faced additional Section 301 duties in recent years on top of the general rate; published tables have cited +25% for many plastic articles alongside a 5.8% general rate for 3916.10.00. Rates and exclusions change frequently, so verify the rate on your entry date.
What documents should a filament supplier provide for US import?
Commercial invoice, packing list, bill of lading, HTS and origin declaration, TDS and SDS, plus any channel-required declarations such as RoHS/REACH or CPSIA/Prop 65 documentation for consumer SKUs.