PTFE tube is a commonly used component in 3D printers, mainly used to guide Filament to the Toolhead. Both ends of the PTFE tube need to be connected using dedicated fittings called Pneumatic Fitting.
This article introduces the installation and removal tips for the PTFE tube, along with precautions and an overview of Pneumatic Fitting.
¶ How to Install the PTFE tube
Follow the instructions in the Quick Start Guide. Prepare the PTFE tube and the printer/accessories to be connected. This guide uses CFS lite and SPARKX i7 as examples:
Insert the PTFE tube into the Pneumatic Fitting. Note: Make sure to push it in fully until it cannot go any further.
After insertion, gently pull it outward a few times to check whether it is securely installed. If it cannot be properly secured after multiple attempts, the Pneumatic Fitting may be damaged and needs to be replaced.
¶ How to Remove the PTFE tube
Note: Do NOT pull the PTFE tube out by force, as this may damage the internal structure and make it unusable.
There is a raised ring on the Pneumatic Fitting. Pressing it down will release the PTFE tube, allowing it to be removed.
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Use one hand to press down the release ring on the Pneumatic Fitting, while using the other hand to pull the PTFE tube outward.
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The operation for the Toolhead Manifold is the same. Tip: The Pneumatic Fitting on the Toolhead Manifold is smaller. If it is difficult to operate with one hand, you may ask for assistance or use tools to help remove it.
To make removal easier, we provide a printable tool: SPARKX i7 PTFE Tube Removal Tool
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¶ What is a Pneumatic Fitting
Pneumatic Fitting is widely used in 3D printers to secure the PTFE tube. Its advantages include:
Easy installation and removal—no tools required; push to install, press to release;
Strong axial holding force, resistant to loosening—even with repeated feeding and retraction;
Automatically centers the tube for smooth filament feeding;
¶ Structure of a Pneumatic Fitting
The structure is simple yet highly effective, consisting of four main parts:
Body (metal/plastic)
Threaded for mounting onto the machine
Internal channel for the PTFE tube
Claw (gripping teeth)
A ring of small metal teeth with barbs
Allows the tube to go in but prevents it from coming out
Seal Ring
Typically rubber or silicone
Provides sealing and radial clamping force
Release Ring (blue or black)
When pressed, the claw expands and releases the PTFE tube
¶ Pneumatic Fittings on SPARKX i7
The SPARKX i7 series uses two types of Pneumatic Fitting:
Larger Pneumatic Fittings Located on the Spool Holder, CFS lite, and CFS mini
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Smaller Pneumatic Fittings Located above the Toolhead Manifold
