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2. How to dis-assemble the D12 extruder?
3. How to level the bed of D12?
4. How to adjust the shaking gantry amounting plate and shaking bed after shipment?
5. How to flash the firmware of D12?
6. How to clean the D12 extruder?
7. How much filament is needed for extruder 1 and extruder 2?
8.How to make the pre-view on your D12 printer?
9.How to wifi transfer the sliced file from computer to printer?
10. The testing Gcode for D12/230.
Benchy Blind object
11. How to install Cura 4.6 onto computer?
12. How to replace the motor driver on the motherboard?
13. How to reset the heating tube cable on motherboard?
14. How to reset the extruder thermistor connector?
15. How to configure Wifi on D12?
16. Diagram， Error Code of D12 And source code for D12.
17. How to Add BL touch onto your D12/230 and D12/300? If you want to add BL touch onto your D12/230 or D12/300, please flash the following firmware.
D12/230BL D12/300BL 
Instructoin
Video Guidance
Video guidance 
Installation manual
If you did not purchase the BL touch from Wanhao. The BL touch cable sequence may need to change as below.
18. Why filament sensor cause the printer stop and how to fix?
19.Why My first generation D12/230 with upgrading BL touch, then Z axis"+" go down, "-" go up?
Because the Z axis chip of 1st generation has Chip TMC2209, then we change to chip 4988. By install the follow firmware would fix the issue.
tmc2209 Instructoin Video
