This is [MARLIN-E3S1PROFORK-BYTT]. A Fork of Marlin 2.1.x-bugfix with the Creality Ender 3 S1 Pro source code included. Personal tweaks, fixes and enhancements included. This firmware is for the Ender 3 S1 Pro (touchscreen) and Ender 3 S1 Plus (touchscreen).

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README.md

MarlinFirmware

Personal tweaks and builds of marlin 3d printer firmware repositories.

Source code is here: https://github.com/ThomasToka/MarlinbySynman/tree/bugfix-2.1.x-tweakedbyThomasToka

My instructions for firmware installations are:

level your bed with old firmware
note your z-offset ex. -1.74mm
flash new firmware
connect with pronterface or other terminal to your printer and issue:
M502 ; factory reset
M851 Z-1.74 ; set your z-offset
M500 ; save configuration
M503 ; check if your z-offset matches
G28 ; home your printer
on the touch start autoleveling (there is no need to do the points if your bed was level before..)
after autoleveling your are ready to print.

Update 08.02.2023 10:42 CET:

It seems there is bug when pushing touch display fast at initial z-offset configuration via touch screen. I opened a bug with the builder of this wonderfull peace of software. https://github.com/synman/Ender-3-S1-Pro-Firmware/issues/20

Update 09.02.2023 10:11 CET:

The touch screen babystepping fast pushing bug has been adressed and (hopefully) fixed. Updated binaries have been uploaded. Feedback welcome.

Update 10.02.2023 10:59 CET:

Updated binaries have been released. Its just a small Fix: The bed is 235x235, standard lcd_rts.cpp, the class managing lcd display only supports integer ex 117. But the bed middle is 235/2=117.5 . So i had to hardcode it to respect the .5 decimal. Works perfectly.

Now my firmware is technically complete, besides laser functionality which is not functional in upstream Marlin-2.1.x-pro-s1 source. So i will have to wait with this till upstream is functional.

Be carefully with your printer. Mine works fine. But this is a new build. So have your fingers near the power button when lowering your z-axis and starting print for the first time.

Please open an issue if there is something wrong.