Starting print height hotend too far from the bed

dakingofhearts2003

I have a qidi tech 1 which is a flashforge clone and the bed moves up not side to side. How do i get the bed closer to the hotend for the starting print height. what sections do i change that in ive been trying to do it through the start script.

G28 ;Home
G29 S1
G1 Z10 F6000 ;Move the platform down 10mm
G92 Z0
G1 X40 Y140 Z0 F9000.000 ; Extruder Prime Dry Move
G1 X250 Y140 Z0 F1800.000 E25.000 ; Extruder Prime Start
G92 E0

alankilian

@dakingofhearts2003

THIS page talks about setting the Z=0 height.

dakingofhearts2003

@alankilian . I need to know what settings in what section i can use to decrease the space between the hotend and the bed cause that stuff isnt working

jay_s_uk

@dakingofhearts2003 you can't go outside your axis limits. So if M208 for S1 is Z0, you can't go lower than that. Best follow the instructions and set your z offset correctly for your probe.

dakingofhearts2003

@jay_s_uk follow what instructions i set the z height to g92 z0 and it starts at 0.28 which i can find nowhere in my homing files or start script.

jay_s_uk

@dakingofhearts2003 post your config, homeall and homez and a photo of your hotend so we can see our probe

alankilian

@dakingofhearts2003

Have you done the procedure to check and set your probe trigger height?

Checking the trigger height

The Z probe trigger height must not vary significantly with XY position. Measure the trigger height of your Z probe at various XY positions and make sure it is consistent. To measure the trigger height:

    Make sure there is no filament stuck to the nozzle (you may want to do this test with the nozzle hot)
    Cancel any existing bed compensation by sending M561
    Send M564 S0 to allow movement lower than where the firmware thinks Z=0 is. This is to ensure that you can lower the nozzle all the way to the bed in step 5.
    Command the print head to the coordinates you want to probe. To probe the center, send G1 Z1.
    Command the print head down in small steps until the nozzle just touches the bed or just grips a sheet of paper. You may also wish to create a macro to lower the head by e.g. 0.02mm to get greater accuracy (G91 followed by G1 Z-0.02).
    Send G92 Z0 to define that height as Z=0
    Command the nozzle up 5mm (G1 Z5)
    Send G30 S-1 to probe the bed without resetting the Z=0 position
    Read off the Z height from the web interface. That is the trigger height.
    Repeat the previous two steps a couple of times to make sure you are getting a consistent result
    Repeat steps 4-10 for the other XY positions you want to check.

Once you are satisfied with your trigger height result (should be between 0 and 4mm, depending on your printer), open your config.g file (this can be found in your DuetWebControl), find the G31 command and enter your trigger height in the Z parameter (ex. G31 X0 Y0 Z1.3).

Phaedrux

@dakingofhearts2003 said in Starting print height hotend too far from the bed:

G28 ;Home
G29 S1
G1 Z10 F6000 ;Move the platform down 10mm
G92 Z0

If this is your start gcode in the slicer why does it use G92 Z0 to set the Z0 point there? It makes no sense. It homes all axis, loads a heightmap, moves down 10mm, sets that point as Z0 arbitrarily, and then does a prime line.

@jay_s_uk said in Starting print height hotend too far from the bed:

@dakingofhearts2003 post your config, homeall and homez and a photo of your hotend so we can see our probe

Let's see what's going on under the hood.