Seckit SK-GO² starter upgrade set - endstop bumper, cable mount, BL-touch, xy optical endstop, filament holder, clips - may als work for other SecKit printers

#DISCLAIMER: - **This is the v0.1 of this thing, so it may contain errors. Please let me know immediately if you stumble across some errors or inconsistencies, so I can improve the thing for all the others!** - **I do not guarantee that the things and Marlin configuration are working with your printer! If you are using any of those things or Marlin configuration you are doing it on our own risk!** ## First of all: I want to thank [Ernest Lin](https://www.facebook.com/lin.ernest.9) for providing such great printers and all the support you need to get up and running. For those who are thinking of ordering a printer and will go along with the credo “SecKit, Your Second 3D Printer Kit the overkill CoreXY platform to get you out of endless repair-tweak-upgrade loop and get things done” it’s definitely worth the wait when ordering at https://seckit3dp.design/ since you will get a complete set which contains all the necessary parts to build (it took me around 20hrs) a working industry grade printer. During the build I already started to work on some upgrades I found on thingiverse and also designed myself. So I created this thing to: - Share the list/links of self printed parts I added to the printer including the stl files of some additionally designed parts I added to the printer. Some of the files will replace the files Ernest is providing on his github page, so you may always doublecheck which design you prefer. This also includes the optional Frame mounted filament holder DELUXE - Share the details about applying the optional optical endstops to my printer running 2209 stepper drivers (files and Marlin 2.x changes) - Share the details about adding an optional BL-Touch to my printer (files and Marlin 2.x changes) ## Upgrades for direct drive setup with E3D V6 hotend *Some of the parts of the Shopping list might already be included in the SecKit kit.* ### Basic setup #### Parts to be printed: - **SK-Go2_Z-Rail_Lower_Endstop.stl** *(this protects the