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Pneumatic fittings
PC4 pneumatic fittings are used for the secure fixation of the PTFE feeding tube in the Bowden systems of 3D printers.
We have pneumatic fittings available for PTFE tubes with an outer diameter of 4 mm, suitable for 1.75 mm filament.
We have pneumatic fittings available for PTFE tubes with an outer diameter of 4 mm, suitable for 1.75 mm filament.
от 5.70 UAH
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Pneumatic Fittings: Purpose and Usage
For most models of 3D printers, the PC4 pneumatic fitting is used for a PTFE tube with an outer diameter of 4 mm.
The main purpose of pneumatic fittings in a 3D printer is to provide a simple and reliable connection between the extruder/thermal barrier and the PTFE tube in Bowden systems.
The fitting connects to the extruder and hot-end through a threaded connection (depending on the fitting model, the thread may be M6 or M10).
The PTFE tube is easily inserted into the pneumatic fitting screwed into the extruder/thermal barrier. The tube can easily slide inside the fitting. However, the PTFE tube cannot be removed without pressing the plastic collet ring. The reliability of the fixation is ensured by a special serrated ring inside the fitting.
While the design of the fitting is simple and reliable, it does have some disadvantages.
The main, and perhaps only, drawback of pneumatic fittings is the method of securing the PTFE tube. The metal ring has sharp serrations that firmly hold the PTFE tube. However, during the operation of the 3D printer, the filament moves forward and backward within the PTFE tube. Despite the minimal friction, the PTFE tube will eventually attempt to move along with the plastic thread. Meanwhile, the serrated locking ring tries to keep the PTFE tube in place, which can lead to the development of serrations where the locking ring grips the tube. This can result in play in the PTFE tube, causing it to loosen from the fitting or even break.
The play in the PTFE tube, in turn, can trigger the plastic collet ring to be pressed, resulting in a weakening of the PTFE tube's fixation in the fitting. To prevent accidental pressing of the collet ring, a special locking clip is used.
The locking clip is inserted into the gap between the plastic collet ring and the metal body of the pneumatic fitting, preventing the mechanism that loosens the connection from being activated.
Buy Pneumatic Fittings for 3D Printers
Our wide range of pneumatic fittings makes it easy to select the right fitting for your specific extruder and thermal barrier model. When choosing a pneumatic fitting for your 3D printer, consider the following criteria:
- Type of thread (M6, M10);
- Outer diameter of the PTFE tube (4, 6 mm);
- Installation location (extruder, thermal barrier).
If you have trouble identifying the right model of pneumatic fitting, feel free to contact us. Our staff will quickly help you find the required part based on your 3D printer model. We are experts in our field!