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Capping the frame

The top rail is the crossbar that connects the two uprights and makes the whole frame rigid. It comes pre-fitted with four screws. This is an easy, satisfying step.
For this step you need four M5x25 screws (from the bag of five) and the number 5 Allen wrench (the largest).

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Step-by-step

1

Find the indented side

One side of the top rail has indentations (grooves) and one is smooth. The indented side must face up toward the ceiling so the screw heads can sit flush.
2

Set it on top

Place the rail across the top of the two uprights, indented side up.
3

Start all four screws

Drop an M5x25 into each of the four holes and thread each a few turns before fully tightening any - this keeps everything aligned.
4

Tighten in a pattern

Work around the four screws, tightening each fully with the number 5 Allen wrench. The heads should sink flush into the track.
If the screws will not tighten all the way and sit on top of the bar, the rail is upside down. Flip it so the indented side faces up.
The top rail is bolted on with all four M5x25 screws flush and tight. The frame is now rigid - you should be able to pick the whole printer up by the top rail.

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Up next

Next you snap on the plastic end caps to cover the sharp rail ends.