I compiled the latest bugfix build for a folgertech ft5 and am having a similar issue with my offset. i dont understand what the z offset is for so, z_offset if primarily for the Mesh Bed Leveling schemes to adjust the distance from the Mesh to the nozzle. G1 Z-1 ;moves to -1 For the time being, until G29 and M851 have found a stable solution for the z_offset problem. This behavior is unwarranted, and easily recitified by resetting the count OR passing an automatic G1 to the endstop in lieu of locking up the whole machine. Follow with M420 S to turn leveling on, or use RESTORE_LEVELING_AFTER_G28 to automatically keep leveling on after G28. What I have gathered from the conversation above is that we are expected to reprobe after changing M851. Notes. Part 4 - D.O.N.E. Because this is not working at the moment, it first approaches the bed, goes a little bit up and then crashes into bed. I measured the offset to .5mm by placing the nozzle on the bed and going up … For X and Y you have to … This calibration should not use regression of the plane function (z=Ax+By+C) it should use regression of the parabolic function (z=Ax2+Bxy+Cy2+Dx+Ey+F). @G2Barbour or maybe this is intended behavior… see G92 NOTES: https://marlinfw.org/docs/gcode/G092.html. As you know, it isn't currently used for Delta's. Raise Z and deploy the probe. I have no bed levelling enabled at all. Already on GitHub? Just have your tool length set as Zero. Change Z probe offset. I need some suggestions for a z offset issue. The easiest way to tune the homed height is to simply do homing, then move the nozzle all the way down to the bed, and if it isn't zero, adjust the z home position by the difference. This value you can set also via display (Marlin): Menu→Control→ Motion→Z-Offset. And I'm still going to do that. A word of warning: be very careful with Z homing with this mod, as if you are already below the Z endstop and you try to home Z, the bed will crash into the extruder. This issue has been automatically locked since there has not been any recent activity after it was closed. is it worth that i bothered config it ? 2. The value for X and Y can be quite coarse. It is also most certainly a bug that the steppers lock up when a G92 is set past the software endstops. So is the autolevel useful or not ? https://github.com/thinkyhead/Marlin/tree/rc_fix_leveling_maths, https://github.com/thinkyhead/Marlin/tree/rc_final_z_correction, https://github.com/MarlinFirmware/Marlin/blob/RCBugFix/Marlin/Marlin_main.cpp#L3240-L3243. so the rcbugfix is still bugged ? It is also used by the Z-Baby-Stepping. Z offset not being saved (marlin 2.0) So still having trouble trying to get my bltouch going. @Roxy-3D i have found drop sagment, replaced it and add one to 5, no changement. I recently setup auto bed leveling which technically is working when I run G29 but I cannot get the nozzle close enough to get a successful print. M851 followed by your offset you noted down in the last step, in the photo above the command would be M851 Z0.00 but yours will look more like M851 Z-0.90. Position values within Marlin are updated, but steppers do not activate. Go to Menu -> Configuration – Probe Z Offs and check the current offset In previous step we … Also, there should be some way to accomplish a live z offset adjustment without having to reprobe. i changed it to 11mm and the nozzle were still at 2 mm above the bed. I was at 13.4mm on z offset on marlin. Changing the machine name would have no affect over it reading from EEPROM or not. I wouldn't be surprised if there are repeat-ability issues when you are probing near the edge of the bed. Ultimately a parameter of M851 that would automatically readjust software endstops would be ideal. Home; About; Listing; Services; Contact Us; Register; marlin z endstop not working But many of the extra goodies will be optional and be able to be turned off if you want to shrink the code size. I begin by sending and adjustment through M851. But once I get the Delta's up and running, I'm going to bring up the Grid Based ABL correction on top of the High Resolution Mesh correction. Again, most hobby mills do not have tool changers but specifying a tool length offset is a good habit to use and most post processors will output a program with it as shown. This number will always be a negative value—the closer your Z-offset is to zero, the further away from the print surface the hot end nozzle will be moved. 2. M500 – Saves our offset we have just input to the printers EEPROM and you are finished setting your Z offset, the offset can also be accessed by the [Delta] Z offset not saving after calibration I own an Flsun QQ-S delta printer and need to increase the temperature limit of the hotend because I’m planning to print with polycarbonate. After you change it, you must re-probe. `` delta_height -= diff; It would also be much better to have a parameter on G1 that activated the M211 S0 state, such as an "I" parameter as is used for M43 when you want to ignore the restrictions of protected pins. Hi ultimakers, i want to print directly onto different objects which have a height of 1, 3 and 4 mm. This value you can set also via display (Marlin): Menu→Control→ Motion→Z-Offset. 4. It doesn't care about the n stops. The offset in X,Y, and Z are the values defined in the firmware (In Marlin Configuration.h). I hope I won't need to resort to that 'fix'. Then I issued a M851 Z0.3 to set a z_offset so the printer would lay it's 1st layer a little bit above the bed, but no matter what I set the z_offset to, the printer always goes to the same position with G1 Z0 even after G28 and tries to print on the same z_height scraping the bed, even if I give z_offset ridiculous values like -10 or 10. It will never be a live Z offset. to your account. I am working on a firmware mod to overcome this danger, but in the meantime just try to avoid homing Z, … G1 Z0 ; terminal ack OK, no movement. I don't want to throw out data. In addition, i have the feeling, that ABL is not working because otherwise i shouldn’t have problem because of compensation the ABL is doing with Bilinear(yes, i have a mesh). Probe responds to M codes for deployment, stowing, and shows no errors, but when it comes to levelling the probe doesn't seem to properly communicate that the Z endstop has been reached. I use a bltouch and no matter what I have my offset set to after the very first line goes down the nozzle drops down onto the bed. Since the firmware that comes with the printer is a marlin variant, I was able to initialize the eeprom, compile Marlin and run through the delta calibration, auto bed leveling, and z-probe offset calibration. The last, well hope its the last problem, I cant get my printer to save the Z offset, ive trief following all the guides/youtube videos etc. I will keep your idea of throwing out points that are too far off the plane defined by the other points in my back pocket. Thx a lot The only place where the probe offset can mess with the Z position is if you used the probe to do Z homing. If you have a delta its much more likely you calibration is off, then the bed is not flat. Or, you can adjust live with BABYSTEPPING which now has the G-code M290. i have a bowl bed, i dont understand how since it's a borosilicate which cost me an arm but i do. What need I to do to get the nozzle right for the 1st layer? Check your Z endstop trigger: EZABL – Z Not Showing “TRIGGERED” M119 Test Once you start a print and babystep z to the correct height, navigate to Menu>Control>Store Settings.This will store the babystep adjustment to use on future prints. I'm beginning to wonder, myself. Successfully merging a pull request may close this issue. I cannot imagine why that would be a good thing or why we would be restricted from setting our own values. But if that is what it takes to get the Grid Based running well, you can bet it will end up in the code! So if setting the z offset then requires reprobing to implement, there should be a fix. And by allowing a solid and efficient way to set z offset, the likelihood of crashing the nozzle actually goes down! But users who want to recalibrate their printer after a M851 and choose to invoke a G33 for that purpose expect G33 to do its job. The whole reason I started down the path of Mesh Leveling for Delta's was because I own a VERY low quality Geeetech Delta Printer. The home offset is persistent — added to the current position until changed. To set a new current Z position, you can use G92. So actually, one of the G-codes I want to add just activates the Z babystepping screen on the LCD. Z offset in Marlin is not working recently. @Nocturnal42 I notice that your probe triggers regularly when your nozzle is at least 1.8mm above the bed, implying that the correct probe offset for your setup is closer to -1.8 than -5.00 as shown. If you are using our latest Marlin 1.1.8 firmware, you can adjust the z-offset with the babystep z function. By clicking “Sign up for GitHub”, you agree to our terms of service and G92, therefore, fractures the steps and counts into two separate entities. @brainscan Remember, a PETG and PLA filament are different so do not use the same Z height for all your filaments! Let's make sure your probe 'repeats' well enough that it isn't causing problems. By clicking “Sign up for GitHub”, you agree to our terms of service and When a G92 is sent, it changes the stored position but not the count. 1. test if you can send manually a G1 Z100 F6000 and if that moves. Installing BLTouch Auto Bed Leveling on the Creality CR-10 3D Printer: In this instructable I’m gonna show you how I installed a bltouch sensor on my creality CR10 3d printer. Have a question about this project? Once the firmware settings are dialed in, you’ll need to check if the BLTouch is working as intended by running a basic test. That is, after all the whole point of setting the z offset to begin with. I really wish it would have stayed that way. It would also be helpful if the documentation was more clear on what actually occurs in the event of M851. Did I misunderstand? I change the "#define CUSTOM_MACHINE_NAME" everytime i make a modification, to be sure the firmware is good just looking at the screen, so i think it's ok. Do i say nonsense ? My Hardware: Mendel90 Lasercut from www.think3dp Is this an 'inductive' probe? But let me help you understand why I'm being slow accepting the ideas. Sign in Sorry! i will postthe results soon. I've had to resort to repeatedly modify->compile->upload to fine tune my offset. It sounds like it may be useful for Delta in some circumstances after all. I some what expect to see 'outliers' when I start probing the the edge of the Print Radius. Please open a new issue for related bugs. By the looks of your screen cap I would try the homing offset, not sure that is what you need but only thing that looks correct to me. For the sake of stability something needs to be done with G33 to cater for these changes. We save the initial offset value to EEPROM, send the new offset value, using the g-code command M206 Z8, through the terminal; setting 8mm as the new home offset. The Z offset can be overridden with M851 Z … Not sure what happened there, I must have inadvertently changed the position of the endstop or probe. M206 could do the trick if XY are disabled for deltas, and only Z is used. At that point, there's just nothing to be done about it. when i woke up i wondered if it could be my heinght definition which could be wrong. In this case the head is moving in a parabolic shape which will also have the effect of an xy scaling problem near farther away from the center. THEN I have to run a G92 in the hopes that it saves the correct position for my users to manually level the bed in the next menu. However, after sending G92 Z0, NOTHING will move and no errors were generated. but u were right, i tuned z home pos to 685 and now it's okay i can print. Test the endstops and use the printer to find the z-probe offset. I have to object to a methodology where G33 has a saved state related to zprobe_zoffset, requiring it to keep a copy of zprobe_zoffset and transparently apply adjustment based on interim changes to zprobe_zoffset. If not maybe this should be considered to reduce the effect of signal noise specially when using z probe designs that induce considerable noise into the measurements. But preventing the user from running G33 (= re-probing) after M851 by insisting on having a non-functional G33 is beyond my comprehension. Check your Z endstop trigger: EZABL – Z Not Showing “TRIGGERED” M119 Test Since it does not, might we at least be able to get the software endstops IMMEDIATELY adjusted by M851? So basically you say M851 needs to be followed by G33; this is exactly what I say as well: change z_offset with M851 and if you want this to reflect in printed height as well run G33 again. The units at line 275 of the Marlin firmware configuration.h file are in the order of X, Y, Z and E. Getting the steps per unit from another printer of the same design would be very close to what you need, and will help you run some stepper motor tests before you get down to calculating accurate steps per unit for the Marlin firmware configuration file. ^^. Does the current Least Squares Fit use Danish robust estimation to diminish outliers that are more than 2 times standard deviation or some other robust regression? The text was updated successfully, but these errors were encountered: A patch is needed to G33 to keep the print height of the first layer in sync with the changes to zprobe_zoffset by issuing command G33 P0 after each zprobe_zoffset change. After a reset I executed "G28 Z" followed by a "G0 Z". Having to force them to set the z offset blind, or run a second probe after finding the offset number is a deterrent to safe operation. @tyssoon If you do a print with just G28 and no G29 is your nozzle still starting 2mm too far above the print surface? More often than not, we see BLtouch(s) not working on people's machine and with it, comes a series of hair pulling frustrations and some even toss their BLtouch(s) into the bin/ out the window. but you're not allowed to use the auto-calibration routine to do that, because a calibration routine that calibrates things is confusing to people who do not want to recalibrate things. Using RCBugFix from about 12 hours ago. But the codebase isn't ready for it, the concept does sacrifice some optimizations, and until all previous probe operations can be re-adjusted, we are taking a step back. But the more I mess around with the High Resolution Mesh, the less convinced I am that we need the other flavors added in on top. M92 and M290 are reset when the printer is homed, so unsuitable for the task at hand. So I disabled the endstops again and lowered the nozzle. Z has to be accurate and has to be adjusted quite accurately. Rich G1 Z5 ;terminal ack OK, no movement*** If you’re not 100% happy with what you’re doing, you might want to wait, at least until there’s a stable Marlin … Is a public "shoutouts" channel a good or bad idea? The honest truth is, if you have the High Resolution Mesh, you don't need anything else. Correct. This issue has absolutely nothing to do with software endstops but by removing this line of code: On the SKR 1.3 with Marlin Bugfix from 27th July babystepping does not appear in the Tune menu. i'll be around, but not near my delta. Has anyone got a hint for me ? I keep thinking about the moody inductive probe example. Adjusting the Z-Offset over Octoprint is working. Imagine reprobing after every 0.12mm of movement as you fine tune the offset. But preventing the user from running G33 (= re-probing) after M851 by insisting on having a non-functional G33 is beyond my comprehension. Personally, I've noticed that using M581 to change the offset does not actually work with G29, even after M500 and M503 to verify, it still uses the default offset regardless of what you set it to. M206 and all functionality related to home and workspace offset are disabled on delta's; they are disabled for a good reason: they do not function properly on delta's; only the Z can be used without causing a lot of trouble. If not maybe robust regression should be considered to reduce the effect of signal noise specially when using z probe designs that induce noise into the measurements. Developers of the Marlin firmware have worked closely with Antclabs and determined that certain modifications to the firmware need to be made. If homing is needed the LCD will blink the X Y Z indicators. Calculate new offset. :D. i managed to correct the rest of the errors alone like a big boy. @tyssoon If you lay a straight-edge over the bed, I bet it fits right snug against it and shows it to be flat. Possibly #8456 caused other problems as well, but this should be reported in a different issue, very little people read old issues that are closed. @thinkyhead But do you think that one outlier is throwing anything off? I'll get all flavors of Auto Bed Leveling working for all types of printers. And M206 is disabled for deltas since the X and Y components force the centre out of the way of the real centre and this is like applying tower_radius_adjustments that set off the calibration as well as the printed dimensions. ... as to the tools required and how the marlin firmware interacts with it. It should at least move in the direction of the endstop (towards positive) when negative. If yes, can you be more specific in the way you did please ? I was at 13.4mm on z offset on marlin. This is the vanilla version of Marlin Firmware 2.x pre-configured for Creality Ender 3 printers with original or generic BL Touch sensors. By the time we are sending G92 or M851 with a special override parameter to ignore software endstops, we have thought it through far more than the times we accidentally crash the nozzle. G1 Z1 ;terminal ack OK, no movement*** for people who calibrate manually (either by probing certain points or doing papertests) and are configuring the delta parameters manually, it is of their choice to set the delta height manually as well to tune the print height of the 1st layer. At which place in the delta levelling is LSF in use? Already on GitHub? There's one outlier, which triggers the probe earlier, at 2.3, a half-millimeter higher than the other probes. so i'll pause the tuning for some time, seeya in a week or two. That's not how M851 works. Procedure to get this value: reports on closed issues, so if we're cautious, we might have a pretty stable 1.1.9 release! We’ll occasionally send you account related emails. Mainly all similar to this below: Procedure to get this value: I don't have the code up and running yet on Delta's. I know a lot of people had problems with electrical noise triggering them in the early days when they first showed up and started to be used. Especially the locations where there is any 'outlier' point. BL Touch new 3.0 units not working with marlin on homing. If you made the changes in configuration.h and uploaded you need to send M502 followed by M500 to update and save the new settings. I am writing a z offset script for some TFT firmware, and I just wanted to go below z=0 for manual adjustment. I attach the concerned part of my configuration.h file. Tuning a delta is tricky, but when out of tune, the height at center and at the edges will differ. @tyssoon All my examination of the code shows that the value being used is the one stored in the variable zprobe_zoffset as set by M851. Printers without a cup or bowl potential (or delta printers if they are known to have minimal (less than 0.1mm) cup or bowl issue) can use robust regression to a plane. A word of warning: be very careful with Z homing with this mod, as if you are already below the Z endstop and you try to home Z, the bed will crash into the extruder. i.e., 680 instead of 682. i dont understand what the z offset is for so ^^. I'm talking about the offset. Marlin told me a Z offset of -1.09. Host will not move if you leave that area. I prefer to use Z_PROBE_OFFSET_FROM_EXTRUDER because I can add comment detail in the custom firmaware as many people work with me on this project. Move Z down slowly until the probe triggers. Some uses include fine adjustment of Z position (without moving endstops) and shifting the coordinate space to print on a different part of the bed. Give the latest patches above a try and issue an G33 P0 command after each M851 to re-synchronize the G1 Z=0 again with the G30 Z=0. I don't have numbers yet. It basically negates the value of having the gcode commands to begin with. babysteps is enabled by double clicking and also in tune menu when print started on mine using marlin 2.0 bugfix from 3/7/2019 on my mega2560. Enable DEBUG_LEVELING_FEATURE and issue the command M111 S255 before doing a G28 and G29. Is there a way in cura to set the z value, so that the starting z-value is 1,3 and 4 mm above the printbed. That's not how M851 works. see. My printer is an Anet A8 with Marlin firmware, I was having issues with the autoleveling sensor and reset the Z offset to 0 and let G29 get the mesh offsets and its working good now.. i go on vacation tommrow guys. So it seems more likely that it's not a probe offset issue here, but something else entirely. Yes. Take the current Z value and negate it. for G33 users: have probe_point report without z_probe_zoffset to G33 probes (there's 2 modes now set by bedlevelprobe) AND let G33 have its own G33_z_offset, modifiable with G33 Zx.xx - nothing to do with M851 and zprobe_zoffset - but that calibrates the delta parameters (including delta_height) at a certain distance from the trigger level. Many thanks! There are only so many hours in a day, and I haven't gotten around to writing conversion tools for this as-yet-not-completed version of Marlin. is there a way to not manually reconfigure the configs.h files ? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Bug Description z-offset does not change live when using the tuning menu. I tried several times to get grip on the heatbed, either I could breathe and could see the filament coming out or the filament landed in the heatbed and not on it. because of the sagging of the z-axis and the z-offset I have not started up the printer properly. But at the moment XYZ are all disabled. The bltpuch works as described, my issue is when it does the The recent version of the BLTouch V3 has been having problems with Creality printers, where it wasn’t working as intended. where is the place in marlin where i can change that please. You signed in with another tab or window. There is also a possibility that the wires are connected loosely. [Delta] Z offset not saving after calibration I own an Flsun QQ-S delta printer and need to increase the temperature limit of the hotend because I’m planning to print with polycarbonate. I have the same problem using Marlin 1.1.0-1. The difference is G33 is not automatically run when M851 is invoked. :). These offsets specify the distance from the tip of the nozzle to the probe — or more precisely, to the point at which the probe triggers. In addition to that be sure you followed ALL the steps of the installation guide (especially the sensor calibration, Z offset, and the slicer settings (starting code is essential, use the one in the guide)). I ended up coding my marlin a little different I think there is a hand full of slightly different methods that will all work. M500 then m502, no results. But locking the machine can't be the intended behavior. And if that solution is suitable for G33 as well; G33 can be modified at that point to take use of that and abandon its own G33_z_offset. Background: Right now for the sake of stability we're reverting some recent additions and taking zprobe_zoffset back to Simpletown, where nothing outside of a single probe knows about zprobe_zoffset. And if the final solution is unsuitable for G33 without applying smart tricks, G33 just keeps its own G33_z_offset. Both will give different results. A correction in the code(*) is needed for G33 P0 to work; it is confusing that G33 P1 and larger works but G33 P0 doesn't. For instance, we changed the Z_RAISE_* options into Z_*_HEIGHT options, so Z_OFFSET_FROM_EXTRUDER offset is no longer used to ensure a minimum height before/between/after probing. Just to clarify what behavior is actually observed: M211 S0 For my 3d printer, the initial home offset will be 8mm; because I allowed about 10mm for home offset when setting Z_MAX_POS in the Marlin firmware.

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