Posts made by iamthebest22

Hi Everyone, hope you all had a Merry Christmas and upcoming happy new year. I have been busy with getting the scara to have consistent improved deviation on the probing accuracy test. with a more rigid setup, I now can get it to usually within 0.02mm of deviation, with the worse being 0.04mm (out of like 11 tries that was the worse), so I'm happy with that. Still, I'm hoping we can implement a probing degree offset for scara printers. I've gotten the duet IR to about 8mm of the nozzle, so hopefully it works for bed leveling.

Back to mesh grid and other issues.

I've changed multiple settings, and here is my current settings. Still getting the error:
M120 G91 G1 Z25 F6000 G90 M121
Error: G1/G2/G3: intermediate position outside machine limits

current setup M669 K4 P98.00 D98.00 A-105.5:106.5 B0:140 C-1:0:0 X100 Y-100 T0.5 S300

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X250 Y250 Z300 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"!io5.in"
M574 Y1 S1 P"!io6.in"

; Z-Probe PRECISION PIEZO ORION NOW DUET IR PROBE SENSOR

M558 P8 C"io3.in" H5 F120 T6000 R0.8 A2
G31 P50 X0 Y0 Z2.30
M557 X33:80 Y15:195 S30 ; define mesh grid

I'm at an absolute loss. dunno what to change so that I can lift z

@dc42 I will do that, I did find some issues (parts cracked on the arms and that may be why), and will fix it, though I probably won't be able to until Monday.

dc42 Merry Christmas and Happy New Year! (If you celebrate it). I got a question, I've been excited for SCARA since your blog 4 years ago.

You mentioned in adding a Z probe in the blog

"It must be possible to mount it very close to the nozzle. In most printers, XY offset between the Z probe and the nozzle can be compensated. But in a SCARA printer, the print head rotates, so the XY offsets are not constant. In principle the Z probe offset from the nozzle could be specified as a modified distal joint angle and a modified distal arm length, so that the probe can be moved to the exact spot required; but RepRapFirmware doesn’t implement this yet."

Would it be possible to implement it? I can wait, better late than never.

Sorry for the delay everyone, was waiting for my Duet IR probe sensor to arrive before I installed it. I got to to about 8mm of the nozzle, which while not perfect, should be close enough. My problem is when I run a macro M48 that is this:

M291 P"Probe will be tested 10 times and return mean and standard deviation. Ok or Cancel?" R"WARNING" S3 ; User must click OK or cancel.
G28
M401
G30 P0 X0 Y0 Z-9999
G30 P1 X0 Y0 Z-9999
G30 P2 X0 Y0 Z-9999
G30 P3 X0 Y0 Z-9999
G30 P4 X0 Y0 Z-9999
G30 P5 X0 Y0 Z-9999
G30 P6 X0 Y0 Z-9999
G30 P7 X0 Y0 Z-9999
G30 P8 X0 Y0 Z-9999
G30 P9 X0 Y0 Z-9999 S-1
M402

I get this result: M292
G32 bed probe heights: -0.933 -0.877 -0.880 -0.877 -0.897 -0.890 -0.887 -0.885 -0.887 -0.885, mean -0.890, deviation from mean 0.015

always one time where it's off by 0.05mm, which is big, my IR probe is slightly angled at about 6 degrees, should it not be angled at all?

My settings:

M558 P8 C"io3.in" H5 F60 T9000 R0.5
G31 P50 X0 Y0 Z1.0
M557 X33:80 Y15:195 S30 ; define mesh grid

I really want to get this working, but man. It's probing against a black matte magnetic flexible bed, so shouldn't have issues.

@joergs5 Thanks and I think I may have gotten something confused myself. With Reprapfirmware, is it possible, cause a scara printer can do this, have a print area that is a half donut shape and have it defined in RRF? Or can you only define it as a square bed or circular? Thanks.

second thing is I'm waiting on the Duet IR sensor to arrive, so I can't test the homing until it arrives, hopefully this week. But yes the first question about the bed size is the most important one, cause I may have been thinking it all wrong this whole time.

@joergs5 Hi joergs, thanks for the fast response. I went to bed right after I posted, was getting too tired.

I should be more clear, I don't expect the BLtouch to solve the G1G2 G3 issue, that's another issue entirely. I have no idea how the arms should behave xD, the only thing I have is this, https://github.com/madl3x/x-scara/blob/master/images/center_position.png

that's different than the G1 H2 X0 Y0 right? when I do that, both arms should be in line, or should it be like this picture?
I want to use the BLtouch because due to the arm not being stiff enough, I can't use a precision piezo orion with accuracy, but I don't think the option to use an offset for SCARA type printers has been create, as dc42 himself said here a few years back:
https://miscsolutions.wordpress.com/2017/09/24/improving-the-robotdigg-scara-printer/

He said, in the adding a Z probe section, with quotes
"It must be possible to mount it very close to the nozzle. In most printers, XY offset between the Z probe and the nozzle can be compensated. But in a SCARA printer, the print head rotates, so the XY offsets are not constant. In principle the Z probe offset from the nozzle could be specified as a modified distal joint angle and a modified distal arm length, so that the probe can be moved to the exact spot required; but RepRapFirmware doesn’t implement this yet."

So should I get a duet IR sensor instead? It should work on those black flexible matte type magnetic bed surfaces?

@iamthebest22 Update: Getting a weird occasional error:

G28

Error: G1/G2/G3: intermediate position outside machine limits

I hate to ask this, but is there anyway to use a BLtouch or similar for a scara printer? I tried using the precision piezo orion, but unfortunately the arm design just enough stiff enough. While the piezo itself works, there's just too big of a deviation due to the arm being lax(and I know it's not the precision piezo orion because I tested it on other machines before and it was working fine with deviations of around 0.006 mm). I'm assuming the offset would be in degrees?

According to the creator Alex, he was able to do this in the config located here:
https://github.com/madl3x/x-scara/blob/master/firmware/Marlin-2.0.x/Marlin/Configuration.h

line 104 says:
// Relative probe offset in angles, required for bed leveling (G29)
#define SCARA_PROBE_OFFSET_DEGREES 20

Would suck not to be able to use this printer now that I've built it.

Thanks for phaedrux, got firmware and some coding issues sorted out. I'm moving into tuning and tweaking now, so i'm posting here.

Need help setting up mesh grid etc for my Duet 3 mini 5+ on a Scara one arm printer. I feel like I might have something wrong with my settings.

Here's the original github for the X-scara printer: https://github.com/madl3x/x-scara/blob/master/firmware/CONFIGURE.md

Marlin config is here if some one can help: https://github.com/madl3x/x-scara/blob/master/firmware/Marlin-2.0.x/config/SCARA/X-SCARA/Configuration.h

Current settings:
M669 K4 P98.00 D98.00 A-105.5:106.5 B18.25:140 C-1:0:0 X100 Y-100 T0.5 S300

I feel like I may have set the distal arm endstop in the wrong location? Here is my setup in the homeing files:
; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Sat Dec 18 2021 16:59:08 GMT-0800 (Pacific Standard Time)
; home x PROXIMAL ARM
G91 ; relative movement
G1 H2 Z4 F100 ; ensure head is clear of the bed
G1 H1 X-250 F3000 ; move proximal joint clockwise up to 200 degrees until the endstop switch is triggered
G1 H2 X10 ; move proximal joint anticlockwise by 10 degrees
G1 H1 X-20 F600 ; move proximal joint slowly to the endstop switch again
M117 "homed proximal arm"

; home y DISTAL ARM
G1 H1 Y20 F3000 ; move distal joint anti clockwise up to 20 degrees FIRST TO PREVENT TOO FAR LEFT THAT IT'LL CRASH!
G1 H1 Y-250 F3000 ; move distal joint clockwise up to -200 degrees until the endstop switch is triggered
G1 H2 Y10 ; move distal joint anticlockwise by 10 degrees
G1 H1 Y-20 F600 ; move distal joint slowly to the endstop switch again
M117 "homed distal arm"

; home z
G1 H2 Z9 F200 ; raise head 4mm to ensure it is above the switch trigger height
G1 H2 X102 F2000 ; move proximal joint anticlockwise by 10 degrees
G1 H2 Y87.5 F2000 ; move distal joint anticlockwise by 10 degrees
G30 ; lower head, stop when probe triggered and set Z to trigger height
G90 ; back to absolute mode
G1 H2 X-60 Y60; move into printable area
G0 X0 Y0; move to zero point
G1 H2 Z30 ; move to 30mm so probing won't fail

video of it currently homing https://www.dropbox.com/s/gph3fu8ar1gilcp/2021-12-19 15.53.02.mp4?dl=0

Reason I'm asking is cause the B parameter is currently set to B18.25:140, and doesn't seem right, but when I do G1 H2 X0 Y0, it does go to the middle and lines up both arms.
d
Second is mesh grid. don't want to use the whole thing yet as I don't have th proper bed size,
M557 X33:80 Y15:195 S30 ; define mesh grid
but it's just goint too far to the left for G32. What should I set it too?

Third is that is there a command to test probe accuracy? Recall there was one awhile back, but forgot. Thanks!

@iamthebest22 Going to "close" this thread as what I'm doing now it's more tuning and tweaking rather than firmware installation. Thanks!

@phaedrux

thought I continue this thread, instead of editing it again and again.

Homing is successful, but not sure if my setting is wrong or something. I had to make this setting:

M669 K4 P98.00 D98.00 A-106:106 B16:140 C-1:0:0 X100 Y-100 T0.5 S300

in order for the arms to be perfectly in line with each other when I send G1 H2 X0 Y0

Is that correct for the B parameter? Thought the first number should be 0. Pretty sure the motors are going in the correct directions.

Update: got probing working sorta, need help with defining mesh grid. Currently I don't want to use the full half donut shape (until I've designed a proper bed for it). Right now the code is:
M557 X15:100 Y15:120 S30
and it's going slightly too far to my left for the first probe point. How should I change this?

Btw is there a command to test probe accuracy?

@phaedrux Thanks again, right now I'm setting up the homing files, it somewhat works, but getting one error and one obsolete command on console.

Update: I'm an idiot, precision piezo orion can't use G1 S1 Z-305 F100 ; move Z down until the switch triggers

they have to use G30 instead. Will report back.

Second update: it's working, but I need the probing speed to be faster, how do I changed that,
I tried M558 P8 C"!^io3.in" H5 F300 T6000 R0.8 and changed F to F2000 but nothing changed.

Third update: Found the issue, set the max speed for Z too low. It's sorted, now I just need to make the piezo not so sensitive.

@phaedrux Thanks once again, okay so just to confirm.

As I am using my Z probe Precision PIezo Orion as also the Z endstop, I don't need to put anything in for M574 for Z, like not even M574 Z0 P"nil" to indicate no endstop and free it up for something else? Thanks.

Right now it's:
; Endstops
M574 X1 S1 P"!io5.in"
M574 Y1 S1 P"!io6.in"

; Z-Probe PRECISION PIEZO ORION

M558 P8 C"!io3.in" H5 F300 T6000 R0.8
G31 P500 X0 Y0 Z-0.2
M557 X15:75 Y15:195 S30 ; define mesh grid

@phaedrux Thanks for the fast response.

I was looking around in some of the threads that was talking about setting precision piezo orion on Duet wifi's and maestros, and saw that on RRF3 , you need to tell which is the Z probe pin, so I thought I'd do that, guess that I was totally off the mark.

What should be the M574 for Z if "M574 Z1 S2 P"io3.in" is not the right setup?

I've changed M558 to M558 P8 C"io3.in" H5 F300 T6000 R0.8 as you've said for my precision piezo orion now, do I need to do anything for M574 ? Thanks.

current code:

; Endstops
M574 X1 S1 P"io5.in"
M574 Y1 S1 P"io6.in"

; Z-Probe
M574 Z1 S2
M558 P8 C"io3.in" H5 F300 T6000 R0.8
G31 P500 X0 Y0 Z-0.2
M557 X15:75 Y15:195 S30 ; define mesh grid

New "problem", I've tried changing M574 Z1 S2 to S1. but both show the Z-probe the precision piezo orion at 1000, it does go to 0 when it triggers, but pretty sure it should be the other way around? Or is S2 correct cause according to https://forum.duet3d.com/topic/19236/piezo-orion-rrf-3-problems/2?_=1639887997050 it needs to be inverted for RRF3.

I'm setting up a Scara type, one arm 3d printer on my Duet 3 mini 5+ . I have the Marlin config if that helps. I'm looking at the duet wiki about setting up Scara, and that has helped me mostly.

Here's the link to the X-Scara printer with Marlin Firmware
https://github.com/madl3x/x-scara/blob/master/firmware/CONFIGURE.md

Running firmware 3.3.0 on web control and the main board
EDIT: Somewhat fixed temp probe problem, but now have another issue.
Temperature is now showing. the problem now is I have the tool selected, but can't change temperature of it.

I followed some of the instructions from here: https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Mini+5++Guide+Part+2:+Configuration/88

Here is my heaters setup in config.g:

M308 S1 P"temp1" Y"thermistor" T10000 B4138
M950 H1 C"out1" T0
M307 H1 B0 S1.00
M143 H1 S280

;Tools
M563 P0 S"Hotend" D0 F0
G10 P0 X0 Y0 Z0
G10 P0 R0 S0
That's the first problem.

The second part that isn't a problem yet, but I'm asking cause I've seen from threads on this, is setting up a precision piezo orion on my mini 5+. Here is what I've got so far, haven't tested it yet, but is this good?

M574 Z1 S2 P"io3.in"
M558 P8 C"^probe.in" H5 F300 T3000 R0.8
G31 P500 X0 Y0 Z-0.2
M557 X15:75 Y15:195 S30

I haven't set up the homing files yet, but I want to solve these two first before I move on to the homing part. Thanks!

Yeah I knew I forgot something, this part in his drawing here that you've posted, either he made an error here, as you can see later on in the instructions here, it gets flipped the other way around. Hence why I am confused with the endstops, but his CAD drawing that I inked and as you said before also show the same thing, hence the confusion, and he hasn't responded in awhile, so I don't know.

https://github.com/madl3x/x-scara/blob/master/hardware/arm/images/assembly/Elbow_RodHub.png

Anyone familiar with SCARA can shed a light on this? It's not hard for me to flip the orientation, but yeah. Or is it as oliof said, it's okay because just need to follow a specific order of homing first the proximal then the distal arm? I couldn't find the setting in the marlin that he gave out here so I don't know either:
https://github.com/madl3x/x-scara/tree/master/firmware

Sorry for the delay, busy time of the year (report cards time etc).

I've take pictures of the thing to hopefully show the cross section of the belt paths better.
1st pic: https://www.dropbox.com/s/vyctnvsfld9p10a/2021-12-08 07.23.12.jpg?dl=0 the top belt is connected to the one that controls the hotend arm, the bottom belt is for the elbow arm.

2nd pic: https://www.dropbox.com/s/qs5b5bkzlqf7y7y/2021-12-08 07.23.33.jpg?dl=0 same thing but I put a knife (I did this in a hurry as I'm at work right now) to show that the 8mm steel rod there is not connected, to the hotend arm, so when the elbow arm moves. it does move the hotend arm, but doesn't actually turn the hotend arm (I'm still trying to remember which is distal and proximal). So there is crosstalk.
Oh okay so yeah then the endstop is fine maybe?

Here is the github for all the information, he also has excellent info which will help with the config settings (cause I am trying to port it to RRF, but have absolutely no idea for some things when I look at the scara wiki on duet wiki).

github: https://github.com/madl3x/x-scara
how to align (the degrees are hard to see, but one says -105 degrees for the center position

https://github.com/madl3x/x-scara/tree/master/images
https://github.com/madl3x/x-scara/blob/master/images/center_position.png

the move in position picture is hard to see the number, but I think it says 50 degrees: https://github.com/madl3x/x-scara/blob/master/images/move_in_position.png

and his marlin firmware (based off the old 2.0.5 I believe, he is working on merging it to the newest 2.0.9.2) that I am using to port it over to RRF that I will need some help with. I know the length of the arms is 98mm for example, but other things like crosstalk etc I need help with.

https://github.com/madl3x/x-scara/blob/master/firmware/CONFIGURE.md

My mini 5+ should be here on Friday (wifi version). and I'll definitely require all your help on this for the endstop (I am using hall effect endstops as recommended by the creator himself).

So it looks like the sensor is fine at the top then?

Hello everyone! I recently just finished building the hardware for a Scara type, but different from the two bar/parallel bar scara and the MP scara (I believe MP scara is different than X-Scara in terms of the how the motors arms are mounted). This 3d printer is called X-scara, link to it here (if that's okay I hope): https://www.thingiverse.com/thing:4500425/comments

I'm using Marlin, but it's having issues as usual. So of course, being the owners of four duet boards (two Duet Wifis, Duet Ethernet, and a Duet Maestro), I ordered a Duet 3 Mini 5+ from Spool3D, and should be here soon.

Okay background is done. My question is this. the Creator is nice enough to create a CAD in fusion with detailed instructions on his github, but I think there's something wrong with one of the endstop locations. I'm asking here because the creator can take quite awhile to respond, and while it's not his fault or anything, I'm trying to get this finished in two weeks. Looking at the CAD of the whole arm assembly, https://myhub.autodesk360.com/ue2a87a43/g/shares/SH919a0QTf3c32634dcf530f7dd13178bc27

You can see the endstop that uses hall effect (looks like two circluar with an arrow in each at the top of each arm part). They are both connected to same "rods" the one that moves the hotend. Is that correct? Should the top one be at the bottom instead? (You can see the 8mm steel rods, I've attached pictures to make it clearer as I suck at explaining things)
https://www.dropbox.com/s/c88cly4qcrnnkyl/2021-12-07 16.10.55.jpg?dl=0
https://www.dropbox.com/s/0eipmqwkznc4g37/2021-12-07 16.11.00.jpg?dl=0
https://www.dropbox.com/s/yo8shwanv4avas6/2021-12-07 16.11.10.jpg?dl=0
https://www.dropbox.com/s/7gzxbvur95vhifk/2021-12-07 16.11.25.jpg?dl=0
https://www.dropbox.com/s/k9c9zb6bw78sz6t/2021-12-07 16.11.25_LI.jpg?dl=0 (This one shows if the endstop should be moved to the one rod below).
Looking forward to make this work, excited to build a scara type printer (despite the complicated things that's making my brain really work)

Thanks!

Any update to this amazing project? I've been wanting to build a Scara type printer for awhile now. had Nicolas' Project HELIOS and then his updated version but it went silent. I see you're using a dragon hotend too. Think your design (when it gets released) will work with a mosquito hotend + precision Piezo orion? Thanks!

Problem solved, well somewhat, but I'll take care of the rest of the issues now. Thanks again!

Aight trying M579 X1.03 Y1.03 then reporting back. can I put it anywhere in the config.g? or do I need to put it before a certain gcode?

Yes I did, but I'm just wondering which one of the two has less of an effect well three if I use M579 (which is similar to scaling in slicer) or play with rod length? I"m leaning towards slicer or M579 but would like to hear professionals advice.