Help with starting print height after modding a qidi tech 1
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; homez.g
; called to home the Z axis
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; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Jul 25 2020 12:56:48 GMT-0400 (Eastern Daylight Time)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 Z205 F1800 ; move Z up until the endstop is triggered
G92 Z0 ; set Z position to axis maximum (you may want to adjust this); Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning -
@dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:
G1 H1 Z205 F1800 ; move Z up until the endstop is triggered
G92 Z0 ; set Z position to axis maximum (you may want to adjust this)That doesn't make any sense. It moves to the high end of the Z axis and then sets it as Z0.
Plus your Z endstop is defined as being on the low end.
M574 Z1 S1 P"zstop" ; configure active-high endstop for high end on Z via pin zstop
Where are you endstops physically located? I think you've got a motor direction wrong and maybe a homing move incorrect as well.
You startup gcode doesn't have anywhere that it homes Z either, just X and Y. Are you using homeall or homez at all?
@dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:
he process i used was the bed to touch the nozzle and used g92 z0 followed by m500.
M500 doesn't work that way, but touching the nozzle to the bed and sending G92 Z0 would set the height correctly.
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The endstop is bed level 0 and as it prints the bed moves down. Everything homes correctly but it keeps starting the prints about 5 mm above the bed if i can fix that im good. some settings in the config i may have changed without changing the explanation to match. like the endstops, i have no problem homing.
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@dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:
G1 H1 Z205 F360 ; move Z up stopping at the endstop
G90 ; absolute positioning
G92 Z0 ; set Z position to axis maximum (you may want to adjust this)Ok so if you endstop is located at Z min, then your homing move in homeall and homez is going the wrong way.
Should be
G1 H1 Z-205 F360If G1 Z205 is moving towards the endstop, then your Z axis motor is rotating the wrong way.
When jogging the Z axis does Z+ move the bed and nozzle farther apart and Z- closer together?
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@Phaedrux i assure you everything is correct i made my own wires and so i had to reverse somethings. If the bed went the wrong way i wouldnf be able to home successfully.
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@dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:
Everything homes correctly but it keeps starting the prints about 5 mm above the bed if i can fix that im good.
After you homeall are you able to jog the nozzle down so that Z0 has the nozzle just touching the bed?
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Hi,
The process you used: Move nozzle to touch bed, G92 Z0 and then M500.
What do you think M500 does in this case?
Frederick
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This is how close it is after homing
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@dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:
This is how close it is after homing
You need to determine how far from the bed the nozzle is at that point.
Then you need to adjust the G92 Z0 line to specify the actual Z position at that point, and it is clearly not 0.
Let's say you determine the nozzle is exactly 5mm off the bed.
Then the line should read G92 Z5.
So then moving to Z0 would move down 5mm and should touch the bed.
Frederick
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@fcwilt i did that and still this is what i get
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Hi,
So you modified the G29 Z# line in the homez.g file?
And the nozzle is now farther away?
Frederick
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@dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:
i assure you everything is correct
And yet your nozzle is 5mm above the bed.
