RRF 3 Z home not triggering.
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@joehsmash said in RRF 3 Z home not triggering.:
some times i wish there was just a chat button haha
There is chat!
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I will have to take a closer look at this, but I don't think you can do exactly what you want to do using both switches for a single probe type, at least not currently. I'll see if I can find that out for certain.
However, adding an actual probe to the nozzle is by far the best solution. Then you can still use the endstops to level the gantry if you wish, but even so, using the probe makes more sense. The tilt needed to cause the switches to trigger makes for a very compliant system.
The fact that moving 50mm up and back down results in changed position means there is some mechanical slop in there somewhere that must be addressed regardless.
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@Phaedrux hmm im just not sure where the slop could be. Its only a lead nut and a gantry that is in the system.
And there is a little slop on the x axis where the lead nut goes into the x gantry but to account for over 1mm on 50mm seems like too much.
I have a bltouch that will be here tomorrow.
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I don't suppose you have video demonstration of how the leveling works in stock configuration?
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@Phaedrux its not my video but this is exactly what it does
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Basically the x and z are on the same tower just like any other printer. Only the y bed moves front to back. And not ghe zx gantry tower.
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That sure is a lot of flex.
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@Phaedrux its not flex, its a really solid frame.
It triggers either side switch and moves approx 1 mm, but only when the nozzle touches the bed. Other than that, all of the weight is on the lead screw. So theres no where for it to go
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It's hard to believe that has any accuracy at all.
Curious design.
The BL Touch should solve most if not all of your problems.
Frederick
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I'd like to understand how it's used in the stock setup because it should be possible to duplicate the behaviour. Do both switches trigger when it's pressing the bed like that? or is it only one or either?
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@Phaedrux in a homing scenario only the left one will trigger, but in a stock set up the switches are physically wired in parallel so it doesn't matter if one or both trigger one is basically like triggering both.
If you want more information feel free to chat me and i can explain every thing about it or just ask here.
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Ok I see. Well you could use it as a switch type probe much the same as the under-bed piezo sensors, albeit less sensitive. If one of the two switches always depresses when the nozzle goes down you can just use that switch in the M558 command. The problem I foresee is that the trigger height (which you'll need to measure just like a normal probe by the way) will vary between different areas of the bed because I think the amount of compliance will change. It would be interesting to see the heightmap at any rate.
You could even still use the switches for independent leveling of the gantry by configuring them as endstops before using them as endstops.
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@Phaedrux incidentally both switches are depressed 100,% of the time, except when it probes the bed.
My worry with the bl is that I won't find a suitable place to mount it. It can't go on either side of the hotend so it would have to go to the front or back.
Im really waiting to get my hands on it so i can see the physical size of it. And come up with a plan on how to mount it.
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I see, so it's triggering when the switch is unpressed?
The BLtouch is quite light, so if you can find a way to attach it with an arm or something that should be doable.
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@Phaedrux correct. The nc switches are currently in an inverted state in the firmware.
Im not an expert on gcode but is there no way to compare marlin to rrf and import some features?
Also im not worried about the weight. More about the physical size.
