B1XZ mod for BIQU B1 (CoreXZ)

B1XZ mod for BIQU B1. Convert your B1 into CoreXZ to get excelent Z axis.
It is even faster than Y :)

I was inspired by CoreXZ machines (Voron Switchwire)
No more lead screws/ball screws or dual z ... use the only CoreXZ kinematic :)

This mod was done for BIQU B1 printer to convert it into CoreXZ and reuse lots of components from the original setup

Publishing a revision2 of STL file set

Assembly instructions and full BOM is coming soon
Use these parts if you know what are you doing or just wait for the final release and instructions.

This setup is driven by the original Marlin configured to CoreXZ (a Klipper setup in progress). Config files for marlin will be published soon

See the first-ever demo video of B1XZ here

https://youtu.be/jDKTgtf7Mfg

The album of very first build is here (just to give clue how to assembly carriages, the instructions are coming)

https://photos.app.goo.gl/iFewBnAZEken7oM17
https://photos.app.goo.gl/2H4JU8Cj7Zjptucw7

On photos and video is the revision 1 it has small differences with published here revision 2

The first impression and build log is here
https://www.reddit.com/r/BIGTREETECH/comments/lrmqu8/new_mod_b1xz_got_almost_ideal_z_alignment_now/

The main thread is here
https://www.reddit.com/r/biquB1/comments/lyn1io/new_mod_b1xz_got_almost_ideal_z_alignment_no/

Uploaded STL files need to be oriented properly
The item B1XZ_x_carriage_tension_tool_removable.stl is only to help to do initial belt tension, To be removed after belts tightened well. Put at this place the B1XZ_x_carriage_bottom_cover.stl

Keep in mind that any CoreXY/XZ/.. setup is very dependent on how good belts are installed

Draft BOM:

• GT2 belt 5m
• 20x bearings F695-2RS
• GT2 Pulley 20 Teeth 5mm bore 6mm
• 2 extension cables for motors
• set of nuts and bolts for m3/m4/m5 - the length and count for each to be defined soon

List of bolts and nuts
M5 bolts 65(60)mm x2pcs , 40mm x6pcs, 35mm x2pcs, 30mm x1pcs
M4 bolts 40mm x2pcs, 35mm x4pcs, 30mm 4pcs, 20mm 2pcs, 16mm x7pcs, 12mm x12pcs, 10mm 12 pcs
M3 bolts 16mm x6pcs, 12mm x12pcs, 10mm x8pcs, 8mm 8pcs
need also M3 bolt with flat cap (see on photos they are back mostly) 10mm x10pcs, 8mm x2pcs
T-Nuts M4 - 26 pcs
M5 nuts with nylon lock - 12 pcs
M4 nuts with nylon lock 4 pcs
Washers for M5 (better nylon for wheels)

PS
Using BLTouch as Z endstop.
But not an issue add into design place for the native end-stop switch - only new cable is needed or extension

Update 08/03/2021
Added v2 version for upper-idler-block (left and right) to have one more constraining bolt
The main discussion thread is moved here
https://www.reddit.com/r/biquB1/comments/lyn1io/new_mod_b1xz_got_almost_ideal_z_alignment_no/

Update 10/04/2021
Start working on assembly instructions and BOM
Alfa version published here
https://www.instructables.com/B1XZ-Assembly/

Firmware config example for Marlin 2.0.7.2
https://github.com/msagit/b1xz/tree/main/Firmware/Marlin

Update 05/06/2021
Enforced bottom x carriage block use new one
B1XZ_x_carriage_bottom_block-v4.stl

Created discord channel for discussions https://discord.gg/zTMmMwj8wZ