SmartPrintCoreH7X © 2024 by Boltz R&D is licensed under GPL V3. To view a copy of this license, visit https://www.gnu.org/licenses/gpl-3.0.en.html ---------------

The SmartPrintCoreH7x is an open-source 3D printer mainboard based on the STM32H7 series microcontroller. It includes 5+1 stepper drivers, with the option to expand by adding more sets of 5 drivers through the upcoming "SmartPrintCore Extravaganza". With a jumper-less setup and a design built for flexibility, SmartPrintCoreH7x is dedicated for makers, tinkerers, and the industry to build and customize.

The Board utilizes self-locking Molex MegaFit(Power Input), Ultra-Fit Tangless (Hotend Heaters), Mini-Lock(Motors and power peripherals) and JST-GH (Digital and IO Peripherals), for easy and worry-free connections.

The board also includes multiple TI Buck converters with more than 90% efficiencies for multiple peripherals

12V 5A Fan and Peripheral Supply 5V 5A Fan and Peripheral supply 5V 10A SBC Supply (Optional, Can be powered by Peripheral Supply, using resistor jumpers in production) Other notable features include -

Compatibility with 12V/24V power supplies Auto power source selection for Board supply from USB/Main Supply. Theraml Considerations -

Low RDS(on) Mosfets are used for minimal losses, which also allows heatsink-less operation for average use cases The PCB design prioritizes heat management, with strategically placed components and optimized power traces that ensure optimal cooling.

All Features

Open-source design, accessible and modifiable. Developed in KiCad. Powered by STM32H723 MCU. Supports 5+1 Stepper motors (Expandable in multiples of 5 using SmartPrintCore Extravaganza expansion board). Supports dedicated five closed-loop external stepper ports. USB-C with auto power switching for seamless MCU power management without setting jumpers. Four PWM and two always-on fan ports (Total 6 Fan ports). Dual voltage compatibility with 24V and 12V power supplies. Four servo channels. Single side-entry locking connector for simplified power input. TI buck converters ensure efficient and reliable power supply to SBC and components. Dedicated 5V supply for SBC (10A max, to support Bigger LCD and other SBC peripherals) with locking connector and Type-C port. Auxiliary power: 5V 5A and 12V 5A for peripherals and fans. 3.3V 1A auxiliary supply for Wi-Fi modules and small devices. High-efficiency MOSFETs for cooler operation. 15A heated bed with a locking connector. Three high-power heaters with locking connectors. Onboard slow-burning fuse for added safety. Optional: External additional inline fuses for power input are recommended (included in BOM). DIP switch configuration for easy sensorless homing setup. Preconfigured switchable microstepping with preinstalled SMD resistors. Buffered signals for motor SPI and UART. Supports both Marlin and Klipper firmware. Clearly marked stepper drivers for easy orientation identification and setup.

Story Time How It Was Created SmartPrintCoreH7x was born out of a combination of long commute hours and a renewed passion for building. With 7 hours a day of travel time, a result of embarking on an exciting single life, there was a great opportunity to reconnect with my hobby of creating innovative hardware. Fueled by endless cups of Chai Tea and free time, I found a new rhythm between the rails and circuits.

Why It Was Created The motivation behind SmartPrintCoreH7x is rooted in both personal need and a broader vision for the 3D printing community:

High-Speed Performance: Designed to handle extremely high printing speeds of 3000 mm/s or more. Unmatched Control: Providing complete control over the hardware, allowing for extensive customization and modification at any time to meet evolving needs, for any organization and individuals. Reliable and Easy Connections: To eliminate common issues with connectivity in intensive printing operations. Open Source Commitment: Ensuring the hardware remains open and accessible, allowing anyone to modify and improve upon the design without restriction. Safety and Reliability: Integrating robust power supplies to safeguard the system, particularly enhancing the performance and reliability of connected Single Board Computers (SBCs). Commitment to Open Source Note: In celebration of our dedication to open-source hardware and software, Boltz R&D endorses the use of BeaglePlay and BeagleBone SBCs with SmartPrintCoreH7X. We are committed to actively supporting the community by ensuring seamless interfacing and integration of these setups or similar setups.

Visit our website https://boltzrnd.com to learn more and download the sources.