Bfb 3D Touch, Set Up And Operation Manual

Page: 51 / 74

3D Touch
Page 51
c. Setting the extruder pressure bearings
The pressure bearing pushes the filament into the extruder drive shaft. In turn, the drive shaft pushes the filament through the hot-end.
The pressure bearing setting is critical to the extrusion process during a print. It is essential to test this setting when first using the printer.
Over-tightening the pressure bearing will over-deform the filament and it will jam in the nozzle tube.
Under-tightening the pressure bearing will not engage the filament with the extruder drive shaft, therefore the filament will not be
driven through the nozzle.
Prepare the extruder for a purge as detailed in . Purge the extruder
Set the spring compression on the pressure bearing to 12mm, as shown below:
Purge the extruder at 60 RPM for 10 minutes.
Now pull out the filament from the nozzle and examine the bite marks left on the filament from the extruder drive shaft. Compare this with
the chart below.
Once the correct pressure bearing setting is established it should be used for each print (this procedure does not need to be repeated
before each print).