This parameter is described in the Klipper docs thus : Location of the endstop (in mm). If I write -5 or 0 or +10 what does it mean? Is it in fact a measured value or a calculated number If its a physical measurement where do I put the ruler ? What are the effects of changing the number ? Thank yo…

I’d just gone over that in setting up TMC driver with sensorless homing. A negative value, you don’t want (I may even error out and not accept it). This setting is a “backoff” amount that the stepper will move when it hits an endstop. It will back off and then re-try the endstop. This is desirea…

Ahh .Thank you both for these explanations . I was under the wrong impression that it referred to the physical position of the endstop switch ( mechanical /optical / point of impact for sensorless ) on the printer . Am I correct in saying then : its a value that determines what the toolhead does o…

Ohh! You are talking about Z-endstop. That is a little different. Sorry. It isn’t recommended to use TMC sensorless homing for Z-endstop, also to that, it isn’t recommended to set this value to zero. You want your sensor to trigger with the tool head NOT hitting the bed. This value would be th…

Let’s try not to mix things: Endstops, as a general and most basic thing, are reference points for your axes. The printer and printer firmware does not know where the mechanical axis are, until you hit an endstop. This is commonly known as homing. Typically the origin of a printer bed (x=0, y=0) i…

Nowahuta , I should have made it clearer , I’m trying to understand the application to the X and Y axes . Sineos , thank you for taking the time to write up the explanation . I understand it much better now . If a negative value is specified for position_endstop : how is this interpreted by Klippe…

With position_endstop and position_max you are talking about the physical limits of your printer. Where it finds it endstops and how far from it an axis can safely travel. The general logic thus depends on the mechanical setup of your printer. Bed-slingers (e.g. Ender 3) often have their X, Y endst…

Yeah. you can have a positive endstop value if your printhead can move further than where the trigger fires in XY or Z. This is possible with mechanical endstops (a bit) and most z probes. If you have a negative value for endstop, you are limiting area avilable to print at (no bed there, don’t prin…

Sineos , its very generous of you to have written this detailed explanation thank you . Thank you too to nowahuta . I think I’ve got a handle on it now because of your descriptions. A small detail: once the printer.cfg is finalised it will run a Corexy Seckit-Go2 printer . All the best.

Negative value doesn’t seem to work. I want the printer to consider 0 to be 2mm from the endstop. IE, hit the stop, then go +2mm, and call that 0. For both X and Y. The actual physical behavior and limits of the machine are for example on Y: if you treat the endstop as 0, then it’s physically possi…

How is the definition position_endstop applied?

General Discussion

Sineos January 16, 2022, 10:15am 2

See Home offset for small PEI - #4 by Sineos

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How is the definition position_endstop applied?

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