This document describes a custom electronics setup for a Voron2.4 printer.
The printer uses three Huvud boards. One is mounted to the toolhead stepper motor and the other two are mounted to the back of the corexy stepper motors.
A single CAN bus is used to communicate with these Huvud boards. The Raspberry Pi running Klipper has a canable USB adapter for CAN bus communication.
A custom wiring harness was made for the CAN bus - the bus routes the toolhead huvud board, to the canable usb adapter, to the rear-right corexy huvud board, and finally to the rear-left corexy huvud board. The wiring harness is comprised of four 20AWG wires: 24V, GND, CANH, CANL. A 120 Ohm "through hole" resistor is soldered between the CAN wires at both ends of the wiring bus (near the toolhead Huvud board and near the rear-left corexy Huvud board).
The toolhead wires follow the filament "reverse bowden" tube. The standard Voron XY cable chains are not deployed. I purchased "1/2 inch black PET wire loom split tubing" (from Amazon) for wire management.
For the wires between the two corexy stepper motors, I designed a rear wire clip to route the wires along the 2020 aluminum extrusion.
This printer uses an experimental Klipper setup using multi-mcu homing. The corexy and Z stepper motors also use "sensorless homing" via Trinamic tmc2209 drivers. The standard Voron XY endstop switches were not deployed. The standard Voron Z endstop switch was not deployed.
The Z sensorless homing is done by moving the Z away from the bed until each Z carriage contacts the top of the rail. I designed Z rail ends for the top of rail contact point.
The Z stepper motors are controlled by a "bigtreetech mini-mz" board. This board was deployed because of its availability at the time of assembly. The board is mounted under the printer via the DIN rails. (The screw holes on the standard Voron Raspberry Pi holder was close enough to the mini-mz mounting holes that I could reuse that holder to mount this board.)
A chamber thermistor is deployed on the rear-left corexy Huvud board. It is a generic "NTC 3950" glass bead type thermistor (purchased from Amazon as a ten pack).