You all kept asking, so here it is!

After countless requests, I’m pleased to now offer my 4" (100 mm) ball-valve blast gate as a mostly assembled, servo-ready kit. This is the same ball-valve design and servo-mounting setup I use in my own workshop.

The gate itself arrives assembled, with the adjustable servo-mounting system and a selection of printed servo-arm adapters included. Simply install your compatible servo motor, connect your electronics, and configure the required open and closed positions.

This kit is ideal for anyone who doesn’t own a 3D printer, or simply wants the printing and gate assembly taken care of so they can concentrate on the electronics and automation.

Please note: A servo motor, electronic controller, wiring, power supply, and control hardware are not included. Some final assembly and configuration will be required.

Two options available:
Without an electronics case

Ideal for those who plan to design, print, or source their own enclosure for the control electronics of their choice.
With my Arduino-compatible electronics enclosure
The specific enclosure I designed to house the Arduino Nano and expansion shield shown in my video.

Key Features

Gate supplied assembled
The main ball-valve gate is already assembled and tested. You only need to install your chosen servo motor, fit the appropriate servo-arm adapter, and complete your electronic setup.
Universal adjustable servo mounting
The updated mounting plate and adjustable brackets are designed to accommodate a wide range of commonly available micro, medium, and large servo motors.
For reliable operation however, medium servos rated at 5 kg or greater are recommended, with larger gates or demanding installations potentially benefiting from a 20 kg servo.
Multiple servo-arm adapters included
A selection of printed servo-arm adapters is supplied to accommodate a range of common servo-horn shapes and profiles.
Ball-valve design
Provides excellent airflow with minimal restriction when fully open compared with many traditional sliding blast gates.
Printed for workshop durability
Components are printed in PETG and/or PLA, depending on the component and current material availability. The gate is intended for woodworking dust collection and general workshop extraction.
Designed for standard 100 mm ducting
The inlet and outlet ports measure 100 mm OD and 96 mm ID. A suitable coupler or flexible hose is recommended for connection.
Individually printed, assembled, and tested
Each gate is printed and assembled by hand, then tested to ensure that the ball opens and closes cleanly. Minor cosmetic marks, layer variations, or light scratches may be present, but these will not affect operation.
Designed for hobby workshop use
Ideal for home and hobby workshops. This product is not a certified commercial or industrial dust-extraction component.

Every unit is printed from durable PETG/PLA, assembled by hand, and tested to make sure it opens and closes cleanly. If you’ve wanted the convenience of a printed blast gate without the print time or assembly work, this is it.

Overall Dimensions:

Width: 160 mm
Length: 190 mm (including handle, and plate)
Height: 180 mm

Port Size:

Outer Diameter: 100 mm
Inner Diameter: 96 mm

Materials:

Casing: PLA/PETG
Ball & Handle: PETG

Included:

100mm ball gate with handle and side hex plate already installed.
Housing washer
Universal mounting plate
Servo housing that suits Micro (not installed by default)
Servo housing that suits medium and larger servos (installed by default)
All of the hardware (bolts/nuts/washers) to install your servo plate

Other colors are available on request and availability.

4" (100 mm) Ball Valve Servo Ready Blast Gate Kit

Name: 4" (100 mm) Ball Valve Servo Ready Blast Gate Kit
SKU: BPWP-4-100-BLAST-GATE-1-KIT

SKU: BPWP-4-100-BLAST-GATE-1-KIT

$80.00

Bundles

Quantity

Temperature & Use Notes
All gates are printed in combination of PETG/PLA for different components. To keep your blast gate performing well:

Don't install near heaters, direct sunlight, or anything that radiates sustained heat.

For indoor environments under 45°C only, (typical PETG softening range begins around 80–90°C, PLA 50-60°C).
Shipping to the United States (Tariffs & Import Notes)

Orders shipped to the United States may be subject to customs duties, taxes, or import tariffs when they arrive. These rules change from time to time, so here’s what you need to know:

Australia Post, the carrier I use, works with a third-party service that specialises in U.S. customs and tariff processing.

This service acts as the importer of record, which means they handle any applicable duties or tariff payments on arrival, and pass that cost to me (including a fee for processing).

Any tariff costs charged to me through this process have already been factored into the shipping price for U.S. customers.

The goal is to make the process as smooth and predictable as possible, so there should be no surprise customs bills when your order arrives. If anything ever does come up, feel free to reach out and I’ll help where I can.
Every gate is printed and hand-assembled by me personally. Because of the nature of 3D printing, each unit is fine-tuned individually, which means there may be slight variations from one gate to the next.

Small visual imperfections such as minor print lines, surface marks, or light filing are completely normal. These do not affect strength, fit, or overall performance in any way.

Some friction during operation is completely normal and actually preferable, as it helps ensure the gate forms a proper seal.

You may find you want to make minor adjustments to the fit based on your own setup or preferences, but under normal circumstances this shouldn’t be necessary.

BARBER'S PADDOCK WOODWORKING

A backyard woodworkers journey

4" (100 mm) Ball Valve Servo Ready Blast Gate Kit

Temperature & Use Notes

Shipping to the US

Assembly Notes