LONGER New Dual Blower Kit installation tutorial

In FDM 3D printing, cooling performance directly affects print quality. Insufficient cooling can lead to issues such as stringing, sagging edges, and blurred details.

To address these common problems, LONGER 3D has introduced an upgraded accessory — the dual blower kit — designed to significantly enhance printing performance and deliver smoother, more detailed models.

What is a Dual Blower Kit?

The Dual Blower Kit is an enhanced cooling system specifically designed for FDM 3D printers. With a dual-fan structure, it provides more efficient and uniform cooling around the nozzle area.

Compared to traditional single-fan setups, it offers:

• Stronger airflow output

• More even cooling across the model

• Improved printing stability

• Better performance on complex geometries

Why Upgrade to Dual Cooling Fans?

If you are experiencing any of the following issues, this upgrade can make a noticeable difference:

• Blurry edges and poor detail definition

• Rough surfaces or visible layer lines

• Severe stringing

• Poor overhang performance

After upgrading, you can expect:

• Sharper details

• Smoother surface finish

• Improved bridging and overhang results

• More consistent and reliable prints

Compatibility

This Dual Blower Kit is compatible with the following models:

• LONGER LK4

• LK4 PRO

• LK1

• LK5 PRO

• U20

• U30

• U30 PRO

Installation Video Tutorial

If this is your first time installing an upgrade, we recommend watching the official tutorial video and following along step by step:

👉 https://www.youtube.com/embed/zEA-eM5sfho

Installation Steps

The installation process is straightforward and typically takes about 10–20 minutes:

1️⃣ Remove the original components

• Remove the hotend fan cover

• Detach the original sheet metal

2️⃣ Install the dual blower kit

• Align the new kit with the gantry beam

• Secure it firmly with screws

3️⃣ Connect the wiring

• Connect the fan wires according to the instructions

• Ensure all connections are secure

4️⃣ Test and verify

• Power on and check fan operation

• Start printing after confirming everything works properly

Important Notes (Must Read)

⚠️ The wiring method is different from the stock fan

⚠️ You must connect the wires in reverse:

Original red/black → New blue/yellow
Original blue/yellow → Connected in reverse

Incorrect wiring may cause the fan to malfunction or damage the device. Please double-check carefully.

BL Touch Compatibility

If you plan to install a BL Touch auto bed leveling sensor at the same time:

• Please download the compatible mounting bracket in advance

• Ensure there is no interference with the dual fan structure

This will help maintain printing accuracy and system stability.

Who Should Upgrade?

This Dual Blower Kit is ideal for:

• Users looking to improve print quality

• Makers printing detailed or complex models

• Users working with PLA / PETG or materials sensitive to cooling

• Hobbyists and studios aiming for higher print success rates

Final Thoughts

A small upgrade can make a big difference in your FDM 3D printing experience. The LONGER Dual Blower Kit not only significantly improves 3D print quality, providing smoother surfaces, sharper details, and better overhang performance, but also helps you unlock the full potential of your LONGER 3D printer. Whether you are printing PLA, PETG, or other materials that require precise cooling, this upgrade ensures more reliable, consistent results. If you're looking to enhance your FDM 3D printer performance and achieve professional-grade prints, the Dual Blower Kit is a smart and worthwhile investment.