Eight : the PTFE should fit inside the hole Extruder outlet. The LGX has a rim 3mm inside the housing to seat the PTFE tube
The actual length of PTFE required is 42.5mm. I rounded to 43mm to give a bit of pressure and seal. (I tried 44mm and it wouldn’t line up)
Ninth : Secure Rapido with mounting plate to the anchor points on the face plate that are marked for the E3D V6 Groove Mount. Using M3x25mm screws
For fixing the LGX Lite and Rapido
First : You have to remove the groove mount off the hotend. Unscrew the 2x M2.5x5mm screws and bag them along with the groove mount (no longer needed) remember the holes where you got the screws out of.
Second : undo the LGX front panel via the hex nuts. You need to add 2x square nuts in the front lower slots to fix the LGX to the mount plate. Then secure front panel
Third : cut a piece of PTFE to 43mm length. Make sure edges are flat, not angled.
Fourth: Secure the Rapido to the mounting plate with the 2x M2.5x12mm screws in the opposite holes you removed previously. (You can actually see the channel for the 12mm screw and for the 5mm screw )
Fifth : Secure LGX to top plate using 2x M3x12mm screws (should be - screw hole - ptfe hole - screw hole)
Sixth : Place the PTFE tube through mounting plate into the top of Rapido
Seventh : Present the tube and assembly to the hole below the extruder. And insert whils pushing hot end up to match the mounting holes on face plate
Better to use 3x M3x16mm for the Cable Holder and M3x20mm for Fan
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