Now you are ready to assembly your name puzzle. I used an glue specifically designed for MDF (Medium Density Fiber Board) but any wood glue will do (e.g. PVA). I initially laminated the outer section of the block to the base, aligning carefully and ensuring that the engraved section was on the outside. At the same time you can attach the knobs to the letters, using the etched area to align the knobs.
After the glue has dried from the initial session (overnight is fine) use the thin sections that surrounded the letters to align the inner sections of the letter correctly. Carefully remove the letters and scrap after aligning the inner parts of the letters, you don't want to glue the letter in place! Wipe off any excess glue.