Technology · FDM
FDM 3D printing for industrial-grade functional parts
Fused Deposition Modeling in engineering thermoplastics — from ABS and PC to PA-CF and ULTEM. The workhorse process for prototypes, jigs, fixtures and short-run functional parts.
Typical tolerance
- 1Upload STEP or STL file
- 2Engineer reviews DFM and material
- 3We print, post-process and QC
- 4Ship in 3–5 business days
Quick answer
FDM (Fused Deposition Modeling) extrudes a thermoplastic filament layer by layer to build parts in real engineering polymers such as ABS, PC, Nylon, PA-CF and ULTEM. Use it for functional prototypes, jigs, fixtures, enclosures and short-run production parts where mechanical, thermal or chemical performance matters more than fine surface finish. Lead time is typically 3–5 business days.
Applications
What FDM is good for
Where FDM wins on cost, speed and material performance in B2B additive manufacturing.
- Functional prototypes tested in the same material as the production part
- Jigs, fixtures and assembly tooling on the shop floor
- Enclosures and housings for electronics and instrumentation
- Manifolds, ducts and low-pressure fluid handling parts
- End-use brackets and mounts in ABS, PC, PA-CF and ULTEM
- Spare parts for legacy equipment (obsolete OEM components)
- Short-run production, 10–500 units, when tooling is not economical
- Large parts up to 500×500×500 mm printed in a single piece
- Chemical- and heat-resistant parts (PPSU, PEEK, ULTEM 1010)
Process
How FDM printing works
From uploaded 3D file to shipped part, the FDM workflow at 3DadditHub.
File review and DFM
Our engineers open your STEP or STL, check wall thickness, orientation and load direction, and flag anything that will not print reliably.
Slicing and toolpath
We select layer height (0.06–0.30 mm), infill (15–100%), perimeters and support strategy based on the mechanical and cosmetic spec.
Print and monitor
Industrial extrusion systems run in temperature-controlled chambers. Engineering polymers print at 260–420 °C on heated build plates.
Post-process and QC
Support removal, optional vapour smoothing, dimensional check with calipers or CMM on critical features, then packed and shipped.
Specs
Materials, resolution and build volume
Common FDM materials
- PLA — cheap, dimensionally stable, low HDT (~55 °C). Concept models only.
- PETG — tough, chemical-resistant, HDT ~70 °C. General-purpose brackets.
- ABS / ASA — impact-resistant, HDT ~95 °C, ASA is UV-stable. Outdoor housings.
- Polycarbonate (PC) — high impact, HDT ~130 °C, tensile strength ~65 MPa.
- Nylon (PA12, PA-CF) — tough, wear-resistant, PA-CF adds stiffness and HDT.
- ULTEM 9085 / 1010 — flame-retardant, HDT 153–216 °C. Aerospace grade.
- PEEK / PPSU — chemical, high-temp and biocompatible variants available.
- TPU 95A — flexible, Shore 95A, for gaskets and vibration mounts.
Print specifications
- Layer height: 0.06–0.30 mm (0.20 mm default).
- Dimensional tolerance: ±0.2 mm or ±0.2% (whichever is greater); tighter on request.
- Minimum feature size: 0.8 mm walls, 0.5 mm embossed detail.
- Maximum build volume: 500 × 500 × 500 mm on a single piece.
- Infill: 15% (light) to 100% (fully dense).
- Finishes: as-printed, sanded, vapour-smoothed (ABS), painted, threaded inserts.
- Anisotropy: Z-strength typically 40–70% of XY. Orient loads accordingly.
Typical case
A real-world FDM order
An industrial automation OEM needed 40 wire-harness routing brackets to replace a machined aluminium part on a robotic cell. Load was low but the bracket had to survive 90 °C ambient near a servo drive. We printed in Polycarbonate at 100% infill, 0.20 mm layer height, with fibres oriented along the load axis. Unit cost came in at €28 per bracket versus €74 for the machined aluminium alternative, and the full batch shipped in 48 hours from file receipt. The OEM has since standardised the design across three production lines.
Decision guide
When to choose FDM vs SLA, SLS or MJF
- Choose FDM over SLA when you need real engineering thermoplastics or larger parts (>250 mm).
- Choose FDM over SLS/MJF for one-offs and very short runs — setup cost is much lower.
- Choose SLA over FDM when surface finish, fine features (<0.3 mm) or dimensional accuracy drive the spec.
- Choose SLS/MJF over FDM at 50+ parts of similar size — nesting drops the unit cost.
- Choose SLS/MJF over FDM for isotropic strength or interlocking assemblies without support.
- Choose FDM over CNC machining when internal geometry is complex or 1–20 units are needed.
- Choose ULTEM FDM over metal for weight-critical aerospace and rail interior brackets.
- Choose metal 3D printing over FDM only when temperature exceeds ~250 °C or loads exceed thermoplastic limits.
FAQ
FDM 3D printing — frequently asked questions
FDM (Fused Deposition Modeling), also called FFF (Fused Filament Fabrication), is an extrusion-based additive process. A heated nozzle melts a thermoplastic filament and deposits it layer by layer along a toolpath, bonding each layer to the one below as it cools. It is the most widely deployed industrial 3D printing technology because it prints in real engineering thermoplastics at low cost per part.
Ready to quote your FDM part?
Upload a STEP or STL file. Our engineers review it, suggest the right thermoplastic and reply with a technical quote within 24 hours.