As depicted on assembly picture, you will need a bottom part, a top cover and 2 axes. The axes should tightly fit the top (cover) element holes. I prepared 3 axes variants with slightly different diameters - 2.7 mm, 2.8 mm and 2.9 mm. You can print all of them and check which one work the best in your printout.
The top part is also prepared in 3 versions - loose, normal and tight. Try printing the normal variant first. When printing tight version I needed to polish up the edges with sandpaper - then I got really nice, well-fitted result.