Appearance
A manufacturer of industrial FDM 3D printers produced hardened steel extruder nozzles (52 HRC, 0.6 mm bore x 12 mm, 30-degree internal taper for Swiss Flow melt geometry) using a PCD-tipped micro gun drill (0.6 mm, Vc = 20 m/min, f = 0.002 mm/rev, oil at 80 bar). Two-pass: 0.5 mm straight pilot, then tapered reaming pass. Concentricity 0.01 mm TIR. Tested at 280°C with PEEK filament: bead width variation < 1%.
3D Printer Component Comparison
| Component | Material | Bore Ø (mm) | Bore Length (mm) | Tolerance | Drilling Method | Vc (m/min) | f (mm/rev) | Surface Finish Ra (µm) | Key Requirement |
|---|---|---|---|---|---|---|---|---|---|
| FDM extruder nozzle | Hardened steel/H13, brass | 0.2–1.0 | 5–20 | Concentricity < 0.01 mm | Micro gun drilling | 15–20 (steel); 40–60 (brass) | 0.001–0.003 | 0.1–0.2 | Consistent extrusion |
| LPBF build platform | Aluminium 6061/Copper | 6–15 | 200–600 | Position +/-0.2 mm | Gun drilling | 200–300 (Al); 80–120 (Cu) | 0.06–0.12 | 0.4–0.8 | Uniform temp (+/-2°C) |
| Binder jetting manifold | 316L/PEEK | 0.5–3.0 | 50–200 | Zero dead volume | Micro gun drilling | 50–70 (316L) | 0.02–0.04 | < 0.2 | No clogging |
| SLA resin vat port | Aluminium/316L | 6–20 | 10–50 | Burr-free | Gun drilling | 100–250 (Al) | 0.05–0.10 | < 0.8 | No particle contamination |
| SLS suction tube | 316L/brass | 6–15 | 500–1500 | Straightness < 0.2 mm/m | Gun drilling | 50–70 (316L) | 0.03–0.05 | < 0.8 | No powder clogging |
FAQ
How are FDM filament extruder nozzles micro gun-drilled, and what taper geometry is required? FDM extruder nozzles require a bore with a smooth internal taper (typically 20–30° included angle) that transitions from the filament entry diameter (1.75 mm for standard filament) to the extrusion bore diameter (0.2–1.0 mm). The taper is produced by a two-pass gun drilling process: first a straight bore at the final diameter, then a tapered reaming pass using a stepped PCD reamer with the taper angle ground into the cutting edge.
What is the temperature uniformity requirement for LPBF build platforms, and how does gun drilling achieve it? The LPBF build platform must maintain a uniform temperature within +/-2°C across the full platform surface (typically 250 x 250 mm to 400 x 400 mm) to prevent the powder bed from overheating or underheating during the laser melting process. The platform is gun-drilled with conformal heating/cooling channels (6–15 mm diameter, 200–600 mm length) that circulate temperature-controlled fluid.
How are binder jetting printhead manifolds drilled for zero dead volume? Binder jetting printhead manifolds require fluid channels with zero dead volume — no crevices or surface roughness that could trap the liquid binder and cause clogging. The channels are micro gun-drilled using PCD-tipped drills at Vc = 50–70 m/min, f = 0.02–0.04 mm/rev for 316L manifolds, then electropolished to Ra < 0.2 µm.
How are SLA resin vat drain ports drilled without burrs? SLA resin vat drain ports are drilled from the inside of the vat (the resin-contact side) using a backup plate that supports the thin vat wall during drilling. The backup plate prevents the drill from breaking through with excessive force that would create a burr on the resin-contact surface. Any burr would contaminate the photopolymer resin with metal particles that cause light scattering during the SLA process.
What is the function of the SLS powder overflow suction tube bore, and how is it drilled? The SLS powder overflow suction tube removes unfused powder from the build chamber through a gun-drilled bore (6–15 mm diameter, 500–1500 mm length). The bore must be straight within 0.2 mm/m to prevent the powder from settling in the tube and clogging. The tube is gun-drilled in 316L stainless steel at Vc = 50–70 m/min, f = 0.03–0.05 mm/rev.
The information provided in this article is for general informational purposes only. Data and recommendations are based on published research and industry experience as of 2026.