This shot shows the majority of what will be the prototype printers guts;

top-right - TEC controller with TEC and thermistor, moving left is the focus stepper with trigger laser below (lit up), and left again is the hexagon mirror motor.

bottom-right - printer head, consisting of the FIFO and UV laser board, Arduino, variable frequency generator, humidity and temp sensor, point of use DC-DC (12v to 5v for head). UV laser test load (diodes and resistor) attached for safety.

bottom-middle - Raspberry Pi Zero on 5v i/o breakout including full size USB-A socket. Connected to the print head boards via Flexible Flat Cable (FFC).

middle-left - stepper controller board with pair of motors for moving the head and base-board feed. If you are interested in these peripheral boards, please see their individual projects in the links.

I'm slowly working on the code for the Arduino that will allow control via UART from the Raspberry Pi Zero, including basic CRC and no-error / error reporting for each command. Finding out if i've made any messups of the UV control system will be interesting.