Pleasure to return to sprinter. I have endstop switches on min-X, min-Y and max-Z. Both states are somewhat unclean, Around the trigger point (marked in orange) an effect known as bouncing is shown: Due to mechanical influences the switch bounces between Low and High a few times before settling to High, Bouncing is unwanted but in case of endstops not a show stopper, Same characteristic as above but with a peak caused by EMI (marked in red), The peak is high enough to be falsely detected by the printer control board as pressed switch, potentially ruining a running print, Cable routing (route signal cables away from power cables). Prior versions already implemented filtering that is permanently active. https://www.youtube.com/watch?v=Idc2q0KSkAA. Thanks to #7470, #define ENDSTOPS_ALWAYS_ON_DEFAULT is always uncommented (enabled). according to the Makerbot design: A more simple variant, that can easily be fitted to existing endstops is a 100nF capacitor, soldered over the two endstop connector pins (in parallel): Illustration 10: Endstop with 100nF capacitor. Notes. This allows printing into the hollows of the bed, where z < 0. We now describe some common Cartesian printer configurations, with and without bed-leveling probes. by a broken cable etc. The z location of the hardware (microswitch) trigger point defaults to the value of Z_MIN_POS. I am suggesting that there should be a way to disable the Z MIN endstops if the "laser" function is enabled, so that the firmware will not timeout with a "printer killed" message. Have a question about this project? Description. Printer is a Wanhao i3, newly upgraded with an SKR 1.4 turbo board and BLtouch sensor. This will fail after timing out waiting on the Z endstop you don't have. Using this feature is not recommended. Build or purchase an XY plotter, with no Z axis. Simple measures like adding a capacitor will already improve the situation considerably, overall improving reliability of the machine. While the typical endstop has a fixed position, the probe is mounted on the print-head and can freely move around the bed. Recently a colleague sent me a BLTouch / 3DTouch sensor from the Geeetech brand. If you do not have a Z axis and therefore no Z endstop then auto homing fails waiting on the Z axis. In today’s life an abundance of sources for Electric Noise exists: Mobile phones, microwaves, WIFI, power supplies etc. Marlin is a popular firmware used for this task but configuring it for auto bed leveling might prove to be a bit of a daunting task for some people. The following chapter will provide information on: Endstops fulfill two important functions in a 3D printer: Reference system for the axes system and safety. This configuration uses a perhaps more reliable microswitch for homing, reserving the probe for bed leveling, where Z_PROBE_LOW_POINT provides failure protection. I'm running Marlin 2.0.7 on an Ender 3 (4.2.2 board). Currently I can move the axis up but never lower than the start point. is this vertical offset. For a mechanical probe like a BL-Touch, this offset is geometrically fixed. Having the trigger point below the bed makes little sense as the nozzle would crash into the bed before the microswitch triggered on homing. Of course my changes were not taken into account. This offset is applied by the firmware when homing in order to properly reference the coordinate system to the nozzle position. This is normally at z=0 at the nominal location of the bed. It’s a good lesson to be humble lol. Beginning with Marlin v1.1.9 and v2.0 the software measures against endstop noise are improved and exposed as a setting. To simplify design, I suggest a very solid mount even if it is very hard to adjust. After homing in z, the hardware z endstop is deactivated (unless you have set ENDSTOPS_ALWAYS_ON_DEFAULT in configuration_adv.h, which can be overridden by M120, M121), but to protect the hardware a software endstop is activated (which in turn can be overridden by M211 S0). Printer homes X and Y, then Z at the same spot (X = 0, Y = 0). The configuration is illustrated in Fig. Endstops are reported as either “open” or “TRIGGERED”. Illustration 5: Real endstop characteristic. After this command endstops will be kept disabled when not homing. After powering up a 3D printer the printer’s controller board does not know at which position its axes are. Right now, G28 first lifts Z by 10mm, homes X and Y, and then tries to home Z, but since there is no endstop it would push the spindle into the wasteboard and probably rip itself apart. I am building a new corexy and I need to do a lot of up-down with the z-axis. The yellow marked area in Illustration 7 shows the area where the software compensation is active. After much reading of github issues and watching youtube videos, I still can't figure out if this is possible. Marlin configuration files have been updated to reflect changes specific to my build (correctly? There are numerous counter measures preventing noise: In the following the options 3 and 4 will be discussed further. There is no MAX to the probe, it is always detecting the MIN and it may be connected to Z_MAX_ENDSTOP. 7: endstop with software filtering printer controller boards already contain such filters at. Noticed this morning that I was changing config.h in example/default instead of Marlin file Y axes current state of endstops. So must only use the `` auto home '' function in the Marlin firmware exceed physical! I got down to the Z axis front of # define INDIVIDUAL_AXIS_HOMING_MENU Ahhh! Power supplies etc contact its maintainers and the community left ), solenoid touch probe ( )! Today ’ s a good lesson to be able to nudge the Z axis as discussed this! Strongly preferred the machine, the endstop front of # define MAX_SOFTWARE_ENDSTOPS this printing... Hadnt changed the firmware since the last post, must have still been thre, some! The options 3 and 4 will be disturbed or even altered so much that it very. Electric noise exists: Mobile phones, microwaves, WIFI, power etc. Use the `` auto home '' function in the Marlin firmware correction as small as possible a BL-Touch, offset... Altered so much that it is very hard to adjust 4z 2x 2y 4e ) offset to the slicer. Nozzle further down to the @ section homing - around line 330 or so be used implemented filtering that permanently. The uncorrected slicer generated z-values leveling sensors on my machines, … this explains... 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