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I'm a bit lost as to where I should set the probe points and such so I wanted to see if any of you had already done the work

I think mhackney uses FSRs, so with any luck he will reply. However, it shouldn't matter what sort of probe you use when deciding on the probe points, so I suggest you decide how many you want and use my bed.g generator at http://www.escher3d.com/pages/wizards/wizardbed.php. If you find that the trigger height varies with probing position (for example, it may be lower when the probe point is not close to any of the FSRs), then you can use the H parameter to correct for that.

I'm having good success with this on a Rostock Max V2 with a Duet and FSRs. It was generated using the tool dc42 links to. You can go to a larger diameter but I found that the bed wasn't flat enough for consistent results too near the edges. Note I have one H value. You likely want to get rid of that.

lignumaqua wrote:I'm having good success with this on a Rostock Max V2 with a Duet and FSRs. It was generated using the tool dc42 links to. You can go to a larger diameter but I found that the bed wasn't flat enough for consistent results too near the edges. Note I have one H value. You likely want to get rid of that.

Code: Select all

; Auto calibration routine for delta printers
; Before running this, you should have set up your zprobe Z offset to suit your build, in the G31 command in config.g.

M561						; clear any bed transform, otherwise homing may be at the wrong height
G31 X0 Y0					; don't want any probe offset for this
G28							; home the printer


; bed.g file for RepRapFirmware
; 13 points, 6 factors, probing radius: 100, probe offset (0, 0)
G28
G30 P0 X0.00 Y100.00 Z-99999 H0
G30 P1 X86.60 Y50.00 Z-99999 H0.05
G30 P2 X86.60 Y-50.00 Z-99999 H0
G30 P3 X0.00 Y-100.00 Z-99999 H0
G30 P4 X-86.60 Y-50.00 Z-99999 H0
G30 P5 X-86.60 Y50.00 Z-99999 H0
G30 P6 X0.00 Y50.00 Z-99999 H0
G30 P7 X43.30 Y25.00 Z-99999 H0
G30 P8 X43.30 Y-25.00 Z-99999 H0
G30 P9 X0.00 Y-50.00 Z-99999 H0
G30 P10 X-43.30 Y-25.00 Z-99999 H0
G30 P11 X-43.30 Y25.00 Z-99999 H0
G30 P12 X0 Y0 Z-99999 S6


G91
G1 S1 X170 Y170 Z170 F15000	; go part way up to speed up homing, endstops activated just in case
G90
G28							; Home the printer again so as to activate the new endstop adjustments

btw I recommend you removed that final G28 homing command. It hasn't been needed for a long time, and by not re-homing, you allow the bed probing to correct for any inconsistency in the homing switches.

dc42 wrote:btw I recommend you removed that final G28 homing command. It hasn't been needed for a long time, and by not re-homing, you allow the bed probing to correct for any inconsistency in the homing switches.

Thank you, will do!

Still need help? I run FSRs on 5 deltas and duet, they work great.

Nope, I'm good. But out of curiousity, what did you use for your probing radius? All the way to the edge or somewhere more in the middle?

I probe as far out as I can. It won't help to give you my radius though because I have a 4 nozzle Kraken so the radius is smaller than yours will be. I am converting to a water cooled V4 today and then to the new Duet prototype that they sent me to test. I'll post the radius then.