Here you can see the part from the previous step, or the X-axis assembly, as well as the aluminum frame, some of the plastic parts, smooth rods, and some hardware needed to put the axes together. The plastic pieces lying in the middle of the frame are the Z Axis Top Right, Z Axis Top Left, Z Axis Bottom Right, and Z Axis Bottom Left.
This is the Z Axis Top Left part being mounted. Unfortunately, the M3 screws provided with the kit were too short for me to put washers between them and the part. I'd like to put washers there in the future.
Another shot of the Z Axis Top Left part. Here you can see the hole for the smooth rod.
Here is the Z Axis Bottom Right part. This piece has a hole as well, in order to fit the smooth rod.
On these parts, the manual says nothing about pre-drilling the holes. On the other hand, I would very strongly recommend drilling out the holes for the smooth rod very slightly in order to get a good fit. One of my Z Axis Bottom Left or Right parts snapped because the hole wasn't large enough (and it was fixed temporarily with this zip tie). Be careful.
I decided to use threadlocker on the ends of all of the frame screws. They were just a bit too short and it worried me that one of the nuts would fall off- so I applied threadlocker, and I have had no problems.
Here the threaded rods are being pushed into the frame assembly. You want to stop pushing the rods in at this point, so that you can slide on the X-axis assembly. Test the X-axis parts to see if they fit the smooth rods. If not, then just tap the ends with a mallet (or loosen them).
And here are the X- and Z-axes connected together. The only flaw with this part of the build was the broken Z Axis Bottom Left, which will get reprinted eventually.
This post is the fifth of ten that goes over my Prusa i3 Rework build. These posts are in the order given on RepRap's wiki page for the Prusa i3 Rework. All of the images from the build are in this Flickr photo album.
My build log: