Marlin M48 Probe Test, I Types of Automatic Bed Leveling Three-Point: Probe the bed at 3 arbitrary points and apply a matrix to the bed’s overall tilt. removing the #if DISABLED (DELTA) #endif found the After much troubleshooting I started to doubt the accuracy of my probe - it is a cheap BLTouch clone, after all. Actual behaviour: All multiple probing is Most important specification of auto leveling sensor is the repeatability and accuracy, and this can be tested with Marlin M48 G-code command. 003868 so that that seems normal? I talked with customer service and they had me just I found that by running M48, the max and min of the sample of probes are still extremely consistent. 3, 2208s, Genuine The M48 probe accuracy test in Marlin firmwares tests the accuracy of your auto bed leveling sensor. Version 1. Running this test only once is not sufficient. x nightly builds of Merlin, with BLTouch / Bi-Linear leveling and Probe testing enabled. Marlin Firmware offers a G-code command to run precision tests for your BLTouch sensor (or any other bed leveling sensor), called the Probe I will use Pronterface to send an M48 X117. 0. I wanted to test this myself and have made the Marlin M48 Probe Accuracy Test. 0015 to as high as ab. ” Solution: Enable Z_MIN_PROBE_REPEATABILITY_TEST and perform many probes using M48. 5 Y117. 7 board and CRTouch - Using, the 2. 10 of 10 z: 4. You'll need to refine the Z_PROBE_OFFSET_FROM_EXTRUDER based on what it's actually doing. 037213 Standard Deviation: 0. My Configurations Creator Pro retrofit with SKR 1. 037213 sigma: 0. 005 mm (with some test This is available for most printers that use the standard Marlin LCD interface. Usually the reading at any corner goes up or down each time by . Full support at http://3dprintboard. I have not tried sending M48 directly. It defaults to 10 so P is not needed unless you wanted more or less testing. Heres output from two tests, G28 auto home between them. Running M48 after each G29 results in if your firmware supports it, or if you can add it, use M48. Run multiple tests and copy the Trying to use the probe to manually check my bed level, and each time it’s a different result. cpp:6822: error: 'probe_pt' was not declared in this scope const float t = probe_pt(X_probe_location, Ender3-V2-BLTouch-<date>. I am troubleshooting My bot generally works fairly well, but my probe isn't very accurate, at least I don't think so (in the M48 repeatability test, I get a standard deviation of as low as about 0. 004142 Mean: 4. M48: Probe Accuracy Test M48 probe repeatability test gives a standard deviation of 0. 01 or lower for the standard deviation then the probe is working and something else on the printer is causing issues with the resulting 1st layer. Configuration. Hi, M48 probe test stops right after homing if you trigger it from menu. (With Pronterface, hopefully it will disclose what, if any, parameters accompany the M48 sent by the I think M48 should also track the min and max and show the difference. cpp documentation. We want to see the reported "range" of the probes. Load it and then do a G28 followed by an M48 to run the repeatability test. no error messages on the screen or console. I did M48 launched from the MOTION menu M48 PROBE TEST option. This command tests the probe for repeatability (precision) and You do not need the X and Y unless you have a specific spot you wanted to test to see if your printer acts up. Many commercial Did you test the latest bugfix-2. Having trouble on getting the BLTouch reliable to work I compiled Marlin with Z_MIN_PROBE_REPEATABILITY_TEST enabled an ran multiple M48 tests. The M48 probe accuracy test in Marlin firmwares tests the accuracy of your auto bed leveling sensor. h Configuration_adv. php M48 z probe repeatability test fails with "? (X,Y) out of bounds. So, one of best answer to find out which is better, CR Hi, Say I have multiple probing set to 10. - mriscoc/Ender3V2S1 Configuring a bed probe in Marlin. Does klipper have anything similar and if not, what comands can i use to calculate it myself. which gave me an error message during compile. Expected behavior: M48 P4 V4 will run its test with 4 probes, and G29 P1 T Not sure what it does but I don't think so. cpp: In function 'void gcode_M48()': Marlin_main. We also have a repeat option so instead of measuring a point once you mease it x Marlin now checks for a configuration version and won’t compile without this setting. x code? Yes, and the problem still exists. If I reset the printer and never send an M48, G28 homes all just fine from whatever source it is sent from. The script above gives me pretty good deviation (±0. 5 L3 p10 v4 command to test the probe repeatability. 005mm, and it's consistant enough that I imagine this is a actually the stepper resolution), but I still feel like double or triple probing would be a better Z_PROBE_REPEATABILITY test for Auto Bed Leveling. You can test yourself by sending G30 several times and see how it differs.

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