DuePrint3

DuePrint3

Duet 3 to Stratasys PDB Interface Board. Used to convert a Stratasys Prodigy series printer (Dimension, uPrint, Fortus 250) to use a modern control board & firmware. This conversion is fully reversable (assuming the printer functions to begin with). Many thanks to AJ Quick and Archeantus (Jeremy) for their past efforts in detailing the electronics of the Dimension/uPrint machines, as well as sharing details on their Duet 2 WiFi conversions.

• https://wiki.cnc.xyz/Stratasys_uPrint_Retrofit
• https://forum.duet3d.com/topic/12647/another-stratasys-uprint-retrofit

Additional details for this project on the Duet3D forums.

At present, the implementation focuses on the Dimension 1200es printers (the implementations linked above focus on the uPrint series, which is quite similar. The electronics are laid out a touch differently, meaning the layout of the new hardware must change, as well where the stepper motor wiring taps in to the existing harness). The Duet 3 Mainboard 6HC, as well as the DP3EXB module (natively running RepRapFirmware/Duet3Expansion) interface with 17 inputs, and 11 outputs.

Inputs

Outputs

Other

Spares Header

The 6HC directly drives the X, Y, and Z stepper motors (vs. controlling them through the Stratasys PDB). The 6HC, unlike the Duet2 (and Duex boards) does not natively have STEP/DIR pins used to emit step and direction pulses. Instead, a DP3EXB expansion board running a fork of Duet3Expansion is used to natively control the extruder's closed loop DC motor. The extruder can be tuned via the ClosedLoopTuning plugin for DWC, with the motor parameters being configured in Config.g. RRF is able to monitor the motor for position errors.

Materials

A detailed BOM can be found here, with the approximate cost being ~$660 (60% of this is Duet3D 6HC, DP3EXB Module, and DuetScreen).

Interface Board Design

The KidCad project for the DuePrint3 board can be found here

Wiring

A detailed wire list can be found here. Connectors & crimps for the Duet 3 6HC are supplied with the board, but are JST VH (stepper motors) and Molex KK / Wurth WR-WTB (Wurth connectors/contacts are supplied with Duet Boards). The interface board 6HC and spares header are JST PHD, and spare 5v and 12v headers are Molex Micro-3.0 series connectors & crimps. The headers for the PBD ribbon cables are Samtec EHT series headers.

DP3EXB Prep

DP3EXB prep to detailed

Interface Board Prep

If the Interface Board (w/Sammy-C21) is the only CAN-FD device, aside from the Duet 3 6HC, place a 2-socket jumper on J13 as indicated to enable the CAN-FD termination resistor.

J11 connects to the 6HC. J12 can be used with additional expansion boards (such as a Duet 3 SZP on the print head, which could be used as an accelerometer or for bed scanning), provided the CAN-FD bus is terminated on the additional board.

RepRapFirmware Prep

At present, the 6HC and DP3EXB are running a fork of 3.6.3 (to be documented). Configuration files are located here, and Macros are located here.