Poignée ergonomique avec mécanisme de déclenchement en acier inoxydable

Ergonomic Grip with Stainless Steel Trigger Mechanism – 3D Printed for Spearguns

General Description

This ergonomic grip is designed to provide a comfortable, secure, and natural hold. The shape follows the anatomy of the hand, with a dedicated saddle for the middle finger and a specific recess for the ring and little fingers, ensuring stability even when wearing 5 mm gloves.

While the default size is Medium-Large, the slim profile allows it to be used comfortably by s with smaller hands as well.

The handle features a reversible line release setup within the trigger mechanism and includes a bracket for mounting action cameras. The internal structure is hollow, allowing for the insertion of foam to balance negative or heavy setups and convert them into positively buoyant ones. Additionally, internal cavities help reduce the overall weight of the grip.

The trigger guard is optimized for vertical reel installation, with a base designed to minimize screw bulk and ensure a stable mount. The rearward reel position improves handling and frees up the front section of the gun.

The t includes a double O-ring seat to ensure the tube remains watertight. The locking pin housing is isolated within a cylindrical chamber to prevent leaks.

An integrated tensioner is included, designed for securing rubbers in roller and pulley configurations. The housing is compatible with various types of Dyneema wishbones.

Compatibility:
Suitable for tubes with an internal diameter (ID) of 26 mm and an external diameter (OD) between 28 mm and 31 mm, made from carbon fiber or aluminum.

Why Purchase This Project?

A high-quality professional grip can cost between \$50 and \$80.
With this project, you can 3D print custom handles for personal use at a cost of only \$7–8 per piece, offering significant savings and full customization freedom.

Professional Trigger Mechanism

The trigger system is manufactured with extremely tight tolerances (to hundredths of a millimeter), ensuring maximum safety, precision, and reliability.

Warning:
Laser cutting must be performed only by experienced professionals. Errors in cutting or bending can compromise functionality and may result in accidental firing.

Recommended materials for internal mechanical components:

• AISI 316 (not 316L)
• AISI 316Ti (titanium stabilized)
• AISI 420
• AISI 440C
• AISI 630

Avoid using AISI 304 stainless steel (such as 18/10 and 18/8), due to low hardness and poor wear resistance.

Tested under static loads of 280 kg for 48 continuous hours.
No responsibility is accepted for damages resulting from incorrect manufacturing.

3D Printing Instructions

• Infill: 100% (solid structure, no internal cavities)
• Enclosed print chamber required

• Recommended materials:

  • ASA
  • PA6-CF
  • PA6-GF30
  • PA12-CF
  • PEEK

Test Results with Reinforced Nylon:

• PA6-GF15 (1.21–1.27 g/cm³): Final weight approx. 270–280 g
• PA6-GF30 (1.35–1.45 g/cm³): Final weight approx. 290–300 g

Recommended CNC Machining Materials

Nylon (PA)

Type	Density (g/cm³)	Key Characteristics
PA6	1.13	Standard Nylon 6
PA6-CF	1.20–1.30	Carbon fiber reinforced
PA6-GF15	1.21–1.27	15% glass fiber reinforced
PA6-GF30	1.35–1.45	30% glass fiber reinforced
PA12	1.01	Low water absorption, floats in water
PA12-CF	1.00–1.10	Lightweight and dimensionally stable
PA46	1.20	High heat resistance
PA66	1.14	Standard Nylon 66

Note: PA12 is ideal for submerged environments due to low water absorption (0.25–0.3%) and density lower than seawater, making it buoyant.

Other Technical Materials

Delrin (POM)

• Delrin 150 / 100 / 527UV: 1.41 g/cm³
• Delrin 570 (glass fiber): 1.42 g/cm³

Teflon (PTFE)

• Teflon G (15–25% glass): ~1.50 g/cm³
• Teflon GF (glass + graphite): ~1.60 g/cm³
• Teflon C (25% carbon): ~1.55 g/cm³

Other Polymers

• ASA: ~1.07 g/cm³
• PEEK: ~1.30–1.32 g/cm³
• Polypropylene (PP): 0.89–0.91 g/cm³

Polypropylene (PP)

An excellent material for underwater use thanks to its lightweight, buoyancy, and impact resistance.

Key Properties:

• Water absorption: nearly zero (<0.03%)
• High flexibility and good wear resistance
• Difficult bed adhesion (requires specific adhesives or build plates)
• Significant warping during printing

Reinforced Variants:

• PP-CF: Carbon fiber reinforced, very rigid and expensive
• PP-GF: Glass fiber reinforced, more affordable and durable

However, reinforced nylon is recommended as the best balance between cost, rigidity, and mechanical strength.

Included Files

Formats: STEP, STL, DXF
Package Contents:

• 3D model of the grip
• Professional trigger mechanism
• Technical drawings in PDF format

Legal Notice

This project is intended for private and recreational use only.
Commercial reproduction or use is strictly prohibited.
The design is ed and protected under the LDpro3D trademark, owned by Lombardo Davide.

Any violation will be prosecuted legally.

Technical Note:
Specifications and parameters for laser cutting and CNC milling depend on the type of machine and the operator’s preferences.
Standardized settings cannot be provided without knowing the equipment used.