⬢Take the IR filament sensor and place it in the holder, make sure the orientation is the same as in the picture.
⬢Take cover and place it on the top. The cover is asymmetrical, see the picture. One side has no "frame" on the bottom side of the cover. Point this side to the connector.
⬢Secure the IR filament sensor and the cover using the M2x8 screw you have removed from the extruder earlier.
⬢Place the entire IR filament sensor assembly on top of the extruder.
⬢Align the left edge with the extruder body.
⬢Use a M3x18 screw to join both parts together.
⬢Carefully pull the cable down until the loop disappears completely. However, don't stretch the cable.
⬢Finish the sensor assembly by tightening the M3x40 screw.
⬢Make sure all the gaps are gone.
The IR filament sensor position will be calibrated later in the upcoming chapter. Without the proper calibration, the MMU2S won't be able to work properly.
⬢Tighten both M3x40 screws, make sure the printed parts are aligned before tightening.
⬢Tighten both M3x10 screws between the Extruder-body and X-carriage. Before you do so, ensure no cable is pinched between both parts, there is a channel in the X-carriage for all the cables.
The fan has two sides, one has a Noctua sticker. Make sure, this side is facing inside the extruder.
⬢First, create a loop on the cable. Make sure the black protective wrap is close to the edge of the fan. See the picture.
⬢Slide the fan close to the X-carriage and GENTLY PUSH the cable in using an Allen key. Before you push the fan all the way to the left, place the cable in the X-carriage channel.
⬢Fix the fan using following screws (depending on the fan version):
⬢Take M3n nut and place it in the Extruder-idler-mmu2s.
Use the screw pulling technique.
⬢Insert the Bondtech gear into the idler as shown in the picture. Make sure the geared part of the Bondtech is on the side of the plastic part with the cutout.
⬢Slide the shaft through the idler and pulley. Use reasonable force or you will BREAK the printed part.
⬢Place your finger on the bearing and ensure it can rotate freely.
⬢Place the Extruder-idler-mmu2s in place and secure it using a M3x40 screw.
⬢Don't tighten the screw too firmly, it serves as a shaft for the idler. Check that the idler can rotate freely (the range of the movement is small).
⬢Use the M3x40 screw with the spring to introduce tension to the Extruder-idler.
Hold the Extruder-idler on the other side, until the screw reaches the nut. Since there is only one screw, you need to introduce a large force. The head of the screw, should be aligned or slightly below the surface.
⬢Gently twist the sleeve to make it smaller and tighter around the cables and slide the sleeve towards the extruder.
⬢Take 3 zip ties and insert them into the lower row of holes on the cable-holder.
⬢Twist the sleeve again (without twisting the cables inside) and tighten the zip ties.
IMPORTANT: Cut the remaining part of each zip tie using pliers as closest to its head as possible. Note the correct position of each zip ties's head (slightly off-centre to the left).
⬢Use two zip ties and push them through the upper slots on the cable-holder. Add the cables from the hotend and use the channel in the printed part to arrange them properly. Tighten the zip ties, cut the remaining parts.
⬢Don't worry about the cable, we will connect it later ;)
⬢Checked everything? Let's move to the MMU2S unit assembly.
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