This guide is intended to help those who have difficulty changing the filament from one print to another with an extruder Bowden. This extrusion system practically breaks up the extrusion of the filament into 2 phases.
Direct extrusion also has these two phases, but being close together we identify the whole with a single block.
The first of the 2 phases is carried out by the extruder (consisting of the thread-pusher motor and clamping) and pushes the wire. Which arrives at the Hot End, the second phase. Then here we deals with the melting and pouring of the plastic on the plate.
Typically in this configuration, the thread-pusher motor and the filament tightening are placed on the frame and connected to the Hot End by a Teflon tube.
This configuration has both advantages and disadvantages compared to direct extrusion. The main advantage is the lightening of the moving part. Reducing problems related to the acceleration and deceleration of the printing process. This makes it less likely that vibrations will occur.
On the other hand, the distance between the two processes makes it more difficult for the engine to push the wire. And for the same reason the printing of flexible or soft materials is also very difficult.
Extruder bowden: Practical Guide
After this necessary framework we come to the removal and change filament for bowden extruder. Although this method can be used successfully with any type of extruder.
- Bring the hotend to the usual temperature at which we print the filament.
- Open the clamping of the filament against the motor pulley. Typically by compressing the spring or unscrewing the screw (depending on the configuration)
- Manually push the filament inside until it comes out of the nozzle. Push about 1 or 2 centimeters (equivalent to 5 or 6 centimeters of filament coming out of the nozzle).
Pull out the filament, without tugging or applying excessive force. If the filament is jammed, repeat step 3.
- Insert the new filament, push manually until the new colour comes out of the nozzle and tighten the thread pusher part again.
- The manual pushing of the filament into the extruder (point 3) is the key part of the process because it helps to eliminate any lumps that may have been created during the cooling of the hotend.
Try our method and tell us how you are! Do you have a better one?