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Building the extruder bar

Now you start assembling the extruder bar - the horizontal rail that will carry your print head. First you mount the filament feeder (the chunky block with the QR code) onto the long bar. This step is a little fiddly, so take your time.
For this step you need the two M4x16 screws (black) and the number 3 Allen wrench. You will also unwrap the two remaining rails and use the longer one as the extruder bar.

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Step-by-step

1

Unwrap and pick the longer rail

Cut the cellophane off the last two rails. One is slightly longer - the longer rail is your extruder bar. Set the shorter one aside for later.
2

Find the correct side of the bar

The bar has a big hole / small hole / small hole side with a machined groove. That groove side must face up and align with the nut on the filament feeder.
3

Sandwich the feeder and bar

Set the feeder with the QR code facing up, lay the bar’s machined groove over the feeder’s nut so it sits flush, then flip the assembly over so you can reach the two screw holes.
4

Screw the feeder to the bar

Push the two M4x16 screws up through the holes into the bar. Thread each with the number 3 Allen wrench - you may need to jiggle the bar to align the holes. Take your time, then tighten both.
This is one of the trickier steps - the screw holes can be hard to line up. If it fights you, loosen slightly, nudge the bar until the hole and screw meet, then thread it in. Patience wins here.
The filament feeder is bolted firmly to the longer bar with both M4x16 screws, the QR code faces out, and the feeder’s click switch presses freely.

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Next you slide the extruder carriage (the print head) onto this bar.