Adds another third row for more watches.

It's not pretty, I purposefully removed the connection between the top and bottom parts to save weight and print time (its printing on my very old ender 3 with poor transparent filament).

I just needed space for two more! Needs to print another top sleeve and bottom rectagle thingy.

I printed at 0.3mm layer height with a 0.6mm nozzle. Scalled to 85% on width and height but 125% on lenght to add a third watch to each side. Makes the bottom plate too close to the top to be usable tho. I don't need it. Also no top/bottom layers, only infill and walls. File is ready to be sliced at normal size! I rescaled afterwards.