Coriander assembly instructions are here: YouTube - This Keyboard is made out of REAL Coriander?!?
Plate files and dimensions for the accent ring can be found on the Files page.
Coriander is a high-profile, four part top mount case. The top, bottom, and base pieces are machined from white Corian - an acrylic-based solid surface material that is typically used for artificial stone countertops. The switch plate is secured to the top case using four M2 screws installed through tabs on the plate. The middle "layer" is a 3.2mm thick metal accent ring that sits in a lip around the outer edge of the bottom piece. The accent ring is not required to assemble the case. A detachable base elevates the case to a 4 degree typing angle. The case pieces are assembled using M3 screws installed through the bottom of the board. A 1/2 inch strip of adhesive-backed cork and a 3D printed stencil were included with each case to cut out the case feet.
Corian proved to be an extremely difficult material to work with. Some of this was expected based on the issues that plagued the failed Lumina keyboard group buy. Due to the difficulty and labor involved in manufacturing Coriander, Trash Man has stated that there will never be a second group buy for the case. The cases were produced by Zaprisco from a single large sheet of Corian. Chris DePrisco (owner of Zaprisco) documented the processes and issues involved in manufacturing the case on his Instagram page. Corian does not "chip" like most metals or machinable plastics such as POM (also known as Delrin or acetal). Instead, Corian turns to powder when CNCed which covered Chris's machinery in a white snow-like dust and caused a multitude of issues. The Corian blocks also needed to be heat treated prior to machining as the parts would warp from the heat of the milling process. Finally, all of the cases were sanded and polished by hand just like a Corian countertop would be, resulting in even more Corian dust across Chris's shop. Chris mentioned that he is still filtering Corian dust out of his machine's coolant months later - even after draining, cleaning, and replacing all of the coolant.
A single prototype was produced to evaluate the machinability of Corian and test the design. The prototype case pieces were not polished like the group buy cases and have a matte finish.
The group buy for Coriander ran in August 2021 on Trashman.club. Cases were sold for $330 and buyers were given the choice between the "universal" top or an S-Class top piece that includes the same 1u blocker as the S-Type MHKB. The Coriander kit included the case top, bottom, and angled base made from Corian, a raw copper accent ring, a "universal" POM plate that supports all Ketch layouts, and assembly hardware. The Corian pieces were hand-polished to a smooth, shiny finish.