8-axis 3D printer motherboard

This project is based on the improvement of Dashu 4-axis board.
MCU uses apm32f103 ret6 (actually there are too many apm32 on hand).
You can also use gd32f103rxt6 instead (more affordable).
The pcb size is not designed because of my own use. 10x10cm. If you need DIY, you can design the pcb file yourself.
The spi interface has an outlet for external resonance test modules.
I have been using the kp firmware for about half a month without any crashes. The maximum printing time is 8 hours and the continuous working time is 2 Days, marlin has not been tested.
The mos tube requires a heat sink. The heating bed I use is relatively large, so I also added it.
74hc541pw is more expensive, you can use 74hc244pw instead.
The 3D shell file and the shell file of Bangzi have been completed. The file format is step. You can modify
the pcb file of the hub according to your needs. The open source of zy143l is used.
(It is recommended to buy the more expensive USB socket of Bangzi. The cheaper one will last a long time. There will be poor contact, and the link will be broken halfway. For the sake of your health and blood pressure, it is recommended to buy the expensive one)
Marlin firmware requires a bootloader to run. After I modified it, it can run without a bootloader. You can refer to :https://www.bilibili.com/video/BV1WM411t71i/?vd_source=e8ed1c490e2566de3ee9034720c660a3
(The essence is to modify the starting memory address, no technical skills)
The open source 6-axis of xiao5333 can also support marlin according to this method.
My board drawing skills are not very good, I only have enough for my own use. Please consider carefully before DIY. I am not responsible for the consequences of DIY.