Double Roller Muzzle Kit mit Griff und professionellem Auslösemechanismus

Grip

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. Its shape follows the anatomy of the hand, with a dedicated seat for the middle finger and a specific recess for the ring and pinky fingers, ensuring stability even when wearing 5 mm gloves.

Although the default size is Medium-Large, the slim profile allows comfortable use even for s with smaller hands.

The grip features a reversible line release inside the trigger mechanism and includes a bracket for mounting action cameras. The internal structure is hollow, allowing foam to be inserted to balance negative or heavy buoyancy and convert it to positive. Additionally, the 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 stable mounting. The reel’s rearward position improves handling and frees the front part of the gun.

The t includes a double o-ring seat to guarantee watertightness of the tube. The locking pin housing is isolated inside a cylindrical chamber to prevent leaks.

An integrated tensioner is included, designed to secure bands 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 outer diameter (OD) between 28 mm and 31 mm, in carbon fiber or aluminum.

Why Buy This Project?

A high-quality professional grip can cost between 50 and 80 dollars.
With this project, you can 3D print customized grips for personal use at a cost of only 7–8 dollars per piece, saving significantly while enjoying full freedom of customization.

Double Roller Muzzle

Double Roller Muzzle Specifications with Stainless Steel Inserts

Muzzle Specifications
The muzzle is designed to be as simple and lightweight as possible. Its compact size does not compromise the handling of the weapon.
The t includes 2 o-ring seats to ensure the watertight seal of the tube, while the stop seat is isolated inside a cylindrical chamber to prevent water intrusion.
The muzzle is compatible with tubes with an internal diameter (ID) of 26 mm and outer diameter (OD) between 28 mm and 31 mm, making it suitable for all commercial tubes, whether carbon or aluminum.

Pulleys Specifications
The pulleys have been designed to allow the muzzle to have the narrowest possible width. Their conical shape lets the elastics occupy minimal space, positioning themselves correctly and without friction between them. They can accommodate elastics up to 17 mm diameter, but a well-extended double 14 mm elastic already does an excellent job.
The angles and diameters of the front and rear pulleys have been carefully studied to reduce bulk and optimize the muzzle’s function.

Steel Inserts for the Muzzle
The muzzle is designed with a stopper and side plates made of stainless steel, laser cut and press-bent.
The stopper consists of a single plate to be mounted laterally on the muzzle with 3 screws, and also includes holes for the pulley shafts, increasing overall rigidity and durability.
The side plates are very compact and feature lateral line retainers.
The line guide plate for the reel is also small and must be secured with 2 screws under the muzzle.

Muzzle Structure
The muzzle structure can be 3D printed (see material specs) or machined from solid Delrin rod using CNC; for skilled s, it can also be worked on a lathe or mill.

Pulleys
The pulleys are included in the 3D printing files but, like the muzzle body, can also be manufactured manually on a lathe or CNC lathe.

Other Features
Near the tube stop housing, there is a through hole where an additional band can be inserted in socket mode.

Professional Trigger Mechanism

The trigger system is manufactured with extremely precise tolerances (to the hundredth of a millimeter), ensuring maximum safety, accuracy, and reliability.

Warning:
Laser cutting must be performed only by skilled professionals. Errors in cutting or bending may compromise functionality and cause 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 (e.g., 18/10 and 18/8) due to its low hardness and poor wear resistance.

Tested under static loads of 280 kg for 48 continuous hours.
No liability is assumed for damage due to improper manufacturing.

3D Printing Instructions

• Infill: 100% (solid structure, no internal cavities)
• Closed printing 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 Materials

Nylon (PA)

Type	Density (g/cm³)	Key Features
PA6	1.13	Standard Nylon 6
PA6-CF	1.20–1.30	Reinforced with carbon fiber
PA6-GF15	1.21–1.27	Reinforced with 15% glass fiber
PA6-GF30	1.35–1.45	Reinforced with 30% glass fiber
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 a 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)

Excellent material for underwater use thanks to its light weight, buoyancy, and impact resistance.

Main Properties:

• Water absorption: nearly zero (<0.03%)
• High flexibility and good wear resistance
• Poor bed adhesion (requires specific adhesives or dedicated plates)
• Significant shrinkage and deformation during printing

Reinforced Variants:

• PP-CF: with carbon fiber, very rigid but expensive
• PP-GF: with glass fiber, more affordable and durable

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

WARNING:
This project is intended for private and recreational use only.
It is ed under the domain LDpro3D, owned by Lombardo Davide.
Any commercial reproduction is strictly prohibited.
Violations will be prosecuted by law.

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.