Printing in the middle of the bed

npm1

Hia,
I have finally managed to get decent prints out of my Tronxy P802MA, and am slowly printing upgrade parts, with the duetwifi at the forefront.

Skipping through, when slicing my code through repetier or cura, the prints don't print in the centre of the bed.

I have come across the code below:

[[language]]
;Sliced at: {day} {date} {time}
;Basic settings: Layer height: {layer_height} Walls: {wall_thickness} Fill: {fill_density}
;Print time: {print_time}
;Filament used: {filament_amount}m {filament_weight}g
;Filament cost: {filament_cost}
T0
M140 S{print_bed_temperature} ;pre-heat bed
G91 ;relative positioning
G1 Z5 ;move Z up 5mm before homing x/y
G90 ;absolute positioning
M117 Homing... ;Put message on LCD screen
G28 ;Autohome to X0, Y0, then Z0
G29 ;Probe bed
G21 ;metric values
M107 ;start with the fan off
G1 Z10.0 F{travel_speed} ;move the nozzle up 10mm
G0 X0 Y0 ;Start at 0/0 instead of where G29 left us
M117 Heating Bed... ;Put message on LCD screen
M190 S{print_bed_temperature} ;heat bed and wait
M117 Heating Extuder... ;Put message on LCD screen
M109 S{print_temperature} ;pre-heat extruder and wait
G92 E0 ;zero the extruded length
G1 F200 E4 ;extrude 4mm of feed stock
G92 E0 ;zero the extruded length again
G1 F{travel_speed}
;Put printing message on LCD screen
M117 Printing...

If possible can someone modify this for the duet in order to get prints dead centre, as i am sure this would help other duet users.

If any one wants to see my config and home files, please ask, you are welcome to reviewing and improving the code for my self and those with the anet/ tronxy clones.

Kind Regards,

dc42

The Duet will print where the Gcode generated by the slicer tells it to. You need to configure the bed size of your printer into your slicer. At the Duet end, check that the X=0 Y=0 point is at the corner of the bed, and if necessary adjust the parameters in your M208 S1 command so that it is.

npm1

ok so far i am slowly making progress
minima is set
x60
y-5
z0
maxima is set to
x280
y215
z210

this is where the progress of the homing is:
told my printer that once the endstops have been reached, that is where the 0 of that axis is.

npm1

The issue i'm having is, adjusting the gap between the x axis stepper motor holder and where the bed actually starts,

The only thing i could think of at the moment is by physically moving the end stop closer to where the bed starts.

I.e.

FrankNPrinter

is that why you have x 60 as a minimum? if so, you will have to do some math to compensate for size of bed vs offset. make a few guestimates or manually place ph in middle of bed and get x,y coordinates you want then after home y, move to that and home z (all do able via g code). plug the dimensions into your slicer for bed size and you should be good to go IMHO, 60 mm is a lot to give up on print volume so am wondering if sensor is that far from edge of bed or if you are cutting off part of usable area? DISCLAIMER, i am a bit of a newbie myself so our betters on here will correct me if i am terribly wrong LOL

npm1

Here are a couple of diagrams:
Exhibit A(Original Setup)

Exhibit B(Potential Setup )

Exhibit B would be physically moving the end stop

FrankNPrinter

i am by no means sure on this but as i understand it, that should not be a problem, just need to dial in offsets for bed geometry. might try moving bed to 4 corners and seeing what the reported position is then base your settings off that. IE 300x300 bed but 400 mm movement on x you may also need to lie to your slicer to get dead on center of bed lol what are you using for that btw?

T3P3Tony

Alternatively you can tell your printer that the minimum is -60, then "0" will be at the logical point you want to print at.

npm1

@T3P3Tony
Thnks
So should the minima and maxima go from this:
minima is set
x60
y-5
z0
maxima is set to
x280
y215
z0

to this:
minima
x-60
y-5
z0
maxima
x220
y220
z0
Would this allow the x0/y0 to be on one of the corners? and get the printer to print in the center.

@ FrankNPrinter
I use Cura/Repetier host since these are free and available on linux, I really like Cura, since the settings seem clear.
I've seen somewhere that in the repetier host that i could set the offset of the bed there
I wouldn't mind a slicer that allows me to tell the print where not to print the brim, skirt, raft i.e. 'don't print bed adhesion in screw holes'

npm1

If anyone ask, I have managed to print successfully, until i decided to take it apart for a potential non-printed upgrade,

npm1

I managed to get the X axis stopping where necessary, so i'd like to mark this thread as SOLVED

This was achieved by printing out a endstop holder for these mechanical switches, so now i have a good enough set up get the homing and placement of the print where actually want it.

Thanks Prusa's, Delta's and CoreXYs