v2
x Carriage
Corrected some gaps
bigger hole for the cables ( now the stepper connector fits easily )
added reinforcement in the stepper holder

Layer Fan
corrected dimensions for the layer fan
added more room for the air intake
corrected the holes for the screws

V1.0

new support for the cables to exit to the back

added 1 mm free space for lower belt ( to user with 16 tooth )

corrected the layer fan position and added thickness , the holes are for m3 screws , no nut needed

use the large Titan Screws

use the wheel not the alem screw for the feed screw ( no room to adjust with the alem )

the offsets for the probe in Marlin are

define X_PROBE_OFFSET_FROM_EXTRUDER 5 // X offset: -left +right [of the nozzle]
define Y_PROBE_OFFSET_FROM_EXTRUDER 26 // Y offset: -front +behind [the nozzle]
define Z_PROBE_OFFSET_FROM_EXTRUDER -0.91 // Z offset: -below +above [the nozzle]

and im using this values in the Marlin ubl section :

define UBL_MESH_INSET 1 // Mesh inset margin on print area
define GRID_MAX_POINTS_X 15 // Don't use more than 15 points per axis, implementation limited.
define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X
define UBL_PROBE_PT_1_X 5 // These set the probe locations for when UBL does a 3-Point leveling
define UBL_PROBE_PT_1_Y 274 // of the mesh.
define UBL_PROBE_PT_2_X 10
define UBL_PROBE_PT_2_Y 30
define UBL_PROBE_PT_3_X 195
define UBL_PROBE_PT_3_Y 26
define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
define UBL_MESH_EDIT_MOVES_Z // Sophisticated users prefer no movement of nozzle

this is a remix of 3 things

https://www.thingiverse.com/thing:2207083

https://www.thingiverse.com/thing:2240359

https://www.thingiverse.com/thing:2192480