Biqu B1 Linear Rails mod

Biqu B1 in comparison to Ender 3 is printer with more rigid table, more powerfull mainboard, easy way to add BLTouch and in my opinion better possibility add second Z screw (there is free place on mainboard for additional stepper driver, which can be used to control 2 Z screw independently)

Main disadvantage of Biqu B1 is very limited option to modify toolhead. There are upgrades to change extruder from bowden to direct, but without hotend change it has a lot less sense.

This design is adapting Biqu B1 to most of modern toolheads, by changing standard carriage on Linear Rails carriage. In this way a lot of designs will be applicable to printer, like Voron Stealthburner. Personally I remixed great lightweight Ofek256 design, which is available in my projects as Cobra Toolhead (https://www.printables.com/pl/model/460657-cobra-toolhead-linear-rails-direct-drive-mount-for).

BOM: - Linear Rails MGN12 (suggested MGN12H) - 300mm - 7x M3 screws & t-nuts to mount Linear Rails - longer M3 screws for X motor mount - 2x M3 heat inserts - Biqu B1 Z limit switch (if you are using BLTouch or any other bed leveling probe you should have unused one)

Assembly:

- Add heated inserts to motor cover body - Unscrew motor - Unscrew Z limit switch - Mount motor cover body (on this step pass cable throught designed holes) - Mount Z limit switch on motor cover body - On mainboard switch cable from Z limit switch to X limit

- If needed add on opposite end stopper to not fall linear rail carriage In case if something is unclear or missing in description, please ask question in comments section.