Testing Resolution / accuracy , Your results wanted! Z Probe Results

jrlederer

I would like to be able to contribute some data for under-bed piezo sensors but unfortunately the cost of the Duet3D prevents me from doing so at the moment. I suspect from oscilloscope and logic analyzer traces that it is at least in the 1 micron region but Arduino/Ramps/Repetier firmware only reports to 0.01mm. Of course, if anybody knows how I can coax Repetier firmware to report G30 either to 0.001mm or in raw Z stepper steps I may be able to give you the data

Mike

Mike,
I've been in the giving mood lately, and similarly to how I hooked up DJDemon's with a diet wifi, I am inclined to gift one to you as well as a personal thank you for all the contributing you do toward this hobby. Shoot me your address and I'll replace the vssa fuse on one of the other 3 boards I'd accidentally fried over the months and didn't know the fuse was replaceable. LoL. Anyway, what I'm gonna do with 4 Duet Wifi boards? ?

BlackTom

@Sabagmn:

Just bought one of those from your early bird special.
Looking forward to trying it.
Planning on using that on a Hypercube Evolution that I am in the process of building.
Thanks for putting in the time and effort needed to develop such a product, and still making it easily available to everyone!

Sandro

@DjDemonD:

Couple of fresh results.

These are with a 20mm "Piezo20" module I am hoping to be able to sell soon, on a kossel XL.

This is the moving head test
Bed probe heights: -0.004 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.006 0.001 0.006 0.006 0.006 0.001 0.001 0.001 0.006 0.001 0.006 0.001 0.006 0.006 0.006 0.001, mean 0.003, deviation from mean 0.003

This is the stationary probing test:
Bed probe heights: 0.001 0.001 0.001 0.001 0.001 0.001 0.001 -0.004 -0.004 -0.004 0.001 0.001 -0.004 -0.009 -0.009 -0.009 -0.009 -0.004 -0.009 -0.009 -0.004 -0.004 -0.004 0.001 -0.004 0.001 -0.004 -0.004 -0.004 -0.004 -0.004 -0.004 -0.004 -0.004 -0.004 -0.004, mean -0.003, deviation from mean 0.003

Same here… I'll install it on my custom coreXY... I hope to get it soon

DjDemonD

I'm just hoping the modules will live up to expectations, have quite a few orders now, so give me a few days guys to make them. But thank you for your support.

DjDemonD

Hi Russ, any chance of an update of the graphs with the latest results?

Russ Gries

will do, its been on my list of To Do's . lots of excitement lately with the release of the QSN. (if you haven't see that let me know, i haven't posted it here because its not directly Duet related… but soon ill be!)
so i haven't had time to work on this project so sorry for my lack of attendance one day at a time.

let me this new data now!

Thanks for all who have added!!

~Russ

Dougal1957

Not heard of that Russ please do post the links?

Russ Gries

DjDemonD and dc42

can you run the test 2 times ( please post one more run of each. I need more data to do the equally with the rest of the data!)

also David, can you run the IR probe you have built, do you have it installed on something you can test? that one is a real mystery still know one has given data on it anywhere! Thanks!

Jrlederer,
That was kind of you to gift a Bord!
Can I ask you to trade an old version 0.8.5 for a Duet Wifi? I have a good never used ( was for a project that i haven't finished yet) 0.8.5 that i did some testing with. then i upgraded that new Delta to a duet wifi. I would just sell it and get a Duet Wifi but no funds for that…
( hey mamma always said its never a bad idea to ask)

and for some reason you say yes but dont want the 0.8.5 ill do a give a give away on my YT channel.. ( sponcerd by you )

ok.

Here is the data from AndreS
still waiting on he second run from you other guys! ( please)

your data added to the workbook.

Higher rezhttp://open-source-energy.org/rwg42985/russ/Projects/3D%20printer/micro%20switch%20Z%20probe%20Data/Bed%20Probes%20accuracy%20others%20added.jpg

looking for more! I want to make a video on this some time so if there are more users why haven't contributed please do so soon!
Thanks!!!

Russ Gries

@Dougal1957:

Not heard of that Russ please do post the links?

ok i posted it here so we dont mess up this thread
https://www.duet3d.com/forum/thread.php?pid=15107
~Russ

DjDemonD

Okay so second run for Piezo20 Hotend Z-Probe www.precisionpiezo.co.uk

Stationary:
Bed probe heights: -0.111 -0.116 -0.116 -0.121 -0.116 -0.116 -0.116 -0.116 -0.116 -0.116 -0.116 -0.116 -0.111 -0.116 -0.111 -0.116 -0.111 -0.111 -0.116 -0.116 -0.116 -0.116 -0.111 -0.116 -0.111 -0.121 -0.111 -0.116 -0.111 -0.116 -0.116 -0.116 -0.111 -0.116 -0.116 -0.116, mean -0.115, deviation from mean 0.003
Done printing file

Moving:
Bed probe heights: 0.004 0.017 0.013 0.019 0.010 0.013 0.013 0.014 0.017 0.014 0.013 0.014 0.013 0.017 0.019 0.022 0.019 0.019 0.013 0.018 0.010 0.010 0.017 0.017 0.019, mean 0.015, deviation from mean 0.004
Done printing file

Russ Gries

ok updated Charts.

I found a few errors on my data selection so I corrected those, That change a few results. but , all for the better.

its all correct now…

also, i added Davids data but would like to have the other data set. all ways better to have a pool of data as a one time run can make you look to good hehe

your data added to the workbook.

Higher rezhttp://open-source-energy.org/rwg42985/russ/Projects/3D%20printer/micro%20switch%20Z%20probe%20Data/Bed%20Probes%20accuracy%20others%20added.jpg

dc42

Russ, if you have a Duet 0.8.5 that you don't want, you can probably find a buyer for it on the reprap.org forum.

My delta is down for maintenance right now, I'll generate another set of date when it is running again

DjDemonD

New Data, Precision Piezo Titan/Aero Piezo Z-probe bracket https://www.thingiverse.com/thing:2404904

15:48:16Bed probe heights: 0.005 0.005 0.000 0.000 0.000 0.005 0.000 0.005 0.005 -0.005 -0.005 0.000 0.000 0.005 0.000 0.005 0.005 0.000 -0.005 0.000 0.005 0.000 -0.005 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 -0.005 0.000 0.000 0.000 0.000, mean 0.001, deviation from mean 0.003
Done printing file
15:47:10M32 0:/gcodes/cartesian_Probe_Testing_Single_Point_36_probes_P_values.gcode
File 0:/gcodes/cartesian_Probe_Testing_Single_Point_36_probes_P_values.gcode selected for printing
15:46:55Bed probe heights: -0.015 0.000 0.005 -0.005 0.000 -0.005 0.000 0.005 0.005 0.005 0.000 0.000 -0.005 0.005 -0.005 0.000 -0.005 0.000 0.005 -0.005 -0.005 0.000 -0.005 0.000 -0.005 0.000 -0.005 0.005 -0.005 0.000 0.000 0.000 -0.005 0.005 -0.005 0.000, mean -0.001, deviation from mean 0.004
Done printing file
15:45:47M32 0:/gcodes/cartesian_Probe_Testing_Single_Point_36_probes_P_values.gcode
File 0:/gcodes/cartesian_Probe_Testing_Single_Point_36_probes_P_values.gcode selected for printing

WZ9V

Tevo Little Monster with BL-Touch converted to Duet WiFi and 0.9 degree steppers on X, Y, Z.

7:50:34 PM: Bed probe heights: 0.149 0.161 0.155 0.158 0.149 0.155 0.158 0.155 0.152 0.143 0.136 0.146 0.115 0.102 0.090 0.036 0.021 -0.003 -0.020 -0.026 -0.023 0.018 0.061 0.121 0.130, mean 0.098, deviation from mean 0.066

7:56:14 PM: Bed probe heights: 0.149 0.183 0.186 0.155 0.152 0.083 0.049 0.021 0.005 -0.014 -0.026 0.002 0.058 0.118 0.155 0.177 0.186 0.186 0.149 0.146 0.130 0.111 0.086 0.043 0.018, mean 0.100, deviation from mean 0.070

7:58:47 PM: Bed probe heights: 0.015 0.015 0.008 0.015 0.018 0.018 0.021 0.015 0.015 0.018 0.018 0.015 0.021 0.015 0.015 0.018 0.018 0.018 0.015 0.011 0.015 0.011 0.015 0.018 0.005 0.008 0.008 0.011 0.018 0.018 0.018 0.018 0.015 0.015 -0.004 -0.010, mean 0.014, deviation from mean 0.006

8:01:26 PM: Bed probe heights: -0.020 -0.026 -0.029 -0.029 -0.032 -0.035 -0.032 -0.035 -0.029 -0.035 -0.039 -0.039 -0.039 -0.035 -0.042 -0.042 -0.042 -0.035 -0.035 -0.023 -0.017 -0.001 0.024 0.046 0.068 0.080 0.102 0.108 0.118 0.115 0.118 0.124 0.127 0.127 0.136 0.140, mean 0.021, deviation from mean 0.069

Probably explains my troubles getting a consistent first layer.

fcwilt

I still have not figured out how to get the kind of results you all are getting.

I am using the dc43 IR unit and it works well but something must be wrong with my build.

One thing that might be important is that repeated calibration runs get better after the 2nd or 3rd but then begin to get worse.

Have no idea that that means.

Frederick

DjDemonD

IMO both the BLtouch and IR sensor have their limitations, BL touch is not as accurate as it really needs to be, the notion that if a probe is within 50 microns its good enough is clearly not correct. IR works fine if you have an evenly reflective surface to IR, and on a delta, no effector tilt. In practice neither of these conditions are easy to meet. IR on a cartesian with an evenly reflective surface is a good prospect. Join the piezo revolution guys

dc42

…or wait for our delta effector, which is close to availability. See https://duet3d.com/wiki/Smart_effector_and_carriage_adapters_for_delta_printer.

number40fan

I have seen on rare occasions a .00* with my IR probe. Most of the time I am between .010-.020

fcwilt

Hi,

To remove any issues with my Z-probe can I use the "paper strip" method on the nozzle touching to bed to perform a calibration?

Thanks.

Frederick

fcwilt

@dc42:

…or wait for our delta effector, which is close to availability. See https://duet3d.com/wiki/Smart_effector_and_carriage_adapters_for_delta_printer.

I am certainly willing to give it a try if it helps me locate my problems.

As a long term solution I don't know if it will help me as I am attempting to equip my printers with Diamond hotends which, of course, need a different mount.

Thanks.

Frederick

WZ9V

As you may have already noticed I ordered a Piezo from you right after I posted those results

I was getting decent results until I foolishly decided to have it do a quick calibration before each print like David talked about in his blog. That's when the BL-Touch inconsistency truly bit me. I started getting first layer adhesion problems that shifted from spot to spot on the build plate. I even tried adding in the G29 mesh leveling but I still could get good adhesion at all spots on the bed using PrintBite. Hopefully I can get deviations like other posted in the 0.005 or less range as opposed to my current close to 0.1 range with BL-Touch. BTW the Tevo Little Monster comes with the BL-Touch from the factory and I had hoped it would work well because people at MRRF 2017 seem to like it on their printers. I'm not impressed with it though.

@DjDemonD:

IMO both the BLtouch and IR sensor have their limitations, BL touch is not as accurate as it really needs to be, the notion that if a probe is within 50 microns its good enough is clearly not correct. IR works fine if you have an evenly reflective surface to IR, and on a delta, no effector tilt. In practice neither of these conditions are easy to meet. IR on a cartesian with an evenly reflective surface is a good prospect. Join the piezo revolution guys