I machined the printbed. 

On the bottom side are holes for high-temperature magnets which are required for the removable printbed. At the rear right corner is a cutout for the printhead, because the nozzle needs to be below the print surface so that different nozzles or print surfaces can be attached. Later I want to add a heatbed, but because of the cutout in the printbed, I can't use a standard one. I plan to build one by my self out of copper tape and capton tape. 

I use 3mm MDF to insulate the printbed from the base frame.