8. XY Plane
Y linear guides
Y rail ↔ Y bridge
Bolt m3 x 10 (5)
Nut m3 (5)
Optical endstop ↔ Y endstop base
Bolt m3 x 10 (2)
Nut m3 (2)
Washer 3 x 8 x 0.8 (2)
Y endstop base ↔ frame
RH bolt m5 x 10 (1)
Flange nut m5 (1)
Action
Attach the Y rails to Y bridges but you don't need to tighten the Y rails at this stage.
The two RH bolts M5 x 30 at the right Y bridge should extrude outward to prevent interference with belt.
X linear guide
The X linear guide can be one of these below:
MGN9H 450mm with end-distance 15mm (light weight and higher speed)
MGN12C 450mm with end-distance 12.5mm (for heavier non-filament extruders)
An MGN9 linear guide is include in Tank v2 kit by default.
X CF back tube ↔ X rail
Bolt m3 x 10 (6)
Nut m3, nyloc (6)
Washer 3 x 8 x 0.8 (6)
XY joiner ↔ Y linear block
Bolt m3 x 08 (4)
Washer 3 x 8 x 0.8 (4)
Y endstop finger ↔ Right XY joiner only
Bolt m3 x 10 (1)
X rail ↔ XY joiners
CF spacer plate (must, for MGN9 rail only)
Bolt m3 x 18 (6)
Nyloc nut m3 (6)
Washer 3 x 8 x 0.8 (6)
Extruder carriage (DAB or the default) ↔ X linear block
Countersunk bolt m3x07 (4)
(Refer to the assembly manual of DAB extruder carriage here)
Action
The XY joiners and the X CF back tube are designed to adopt both MGN9 and MGN12 rail, so only some holes match your X rail choice.
The CF spacer plate is a MUST if you're using an MGN9 X rail for a correct CoreXY belt layout. Remove the CF spacer plate if you're using an MGN12 X rail.
Here are the steps to find XY squareness:
Loosen related components
Loosen the nuts of XY joiners to Y rails
Loosen the nuts of Y rails to the frame
Tighten the nuts of X rail to XY joiners
If the belts are attached, loosen them.
Squareness of X to left Y rail
Press BOTH XY joiners to Y-Max against the frame which acts as the Y-Max stopper.
Use a square ruler to find the squareness of X and left Y rail, and tighten all nuts of the LEFT Y rails, and XY joiners to Y linear blocks. If you don't have a square ruler, just push the left Y rail to the inner side of the left Y bridge for a rough squareness.
Squareness of X to right Y rail
Tighten ONE nut of the right Y rail near Y-Max so the end of right Y rail near Y-Max is fixed.
Move and press X rail to Y-min, and tighten ONE nut of the right Y rail near Y-min.
Tighten all other nuts of the Y rail.
Exam
You should feel the same smoothness when sliding the gantry along the Y rails.
Front pulley sets
Front pulley housing ↔ Frame
RH bolt m5 x 10 (2)
Flange nut m5 (2)
Rear pulley sets
NEMA17 stepper ↔ Rear pulley housing
Bolt m3 x 06 (4)
2GT 20T B5 pulley (1)
Belt tensioner
Bolt m4 x 12 (1)
Nut m4 (2)
Rear pulley housing ↔ Frame
RH bolt m5 x 10 (2)
Flange nut m5 (2)
CoreXY belts
5-meter 9mm-width Gates belt
Action
Use a small flat head screw driver to help guide the belt through XY joiners.
Face the smooth side to the smooth F604zz idlers, and the tooth side to the toothed 2GT idlers. Flip the belt 1 time at the outer Y section.
The total length of two XY belts is less than 5 meter. A 5 meter Gates belt roll is included in the Tank v2 kit. This will be plenty for 2-XY-stepper configuration.
If you're building for a 4-XY-stepper configuration, don't leave long tails while installing XY belts. Preserve a 3 cm tail at the belt clamps (extruder carriage) will be fine.
For beta kits only
The CF belt clamps included in DAB are a bit thicker while clamping the belts. Please sand them down for about 0.2mm 🙏
Proper Belt Tension
Bolt m4 x 12 (1)
Nut m4 (2)
Loosen the four M3 bolts of XY steppers and adjust the M4 tensioner bolts for proper tension. Fasten all bolts after adjustment.
In this video the XY belt tension (of a Tank v1) is too low and belts vibrate when the extruder moves quickly. The vibration propagates back to the extruder and results in undesired vertical fine artifacts.
Please tense you XY belts to a level that they won't vibrate in the fastest speed in your common use cases. Note that too high belt tension will bring extra load to the stepper and reduce the life of pulley system.
