Calibration Compromised, cannot reach front points.

I have put together my kit multiple times since I received it (back in mid November this year), but I been getting the same issue when I tried calibrating it. I usually get the message that the front points of the bed cannot be reached. I looked through the manual that came with the kit, which said I needed to fix the M10 Nuts on the Y-axis threads, making sure there was the 100mm distance from the back end to the Z-axis frame (I used a calibrator and ruler to ensure everything was correct). I also got engineering drawings of the entire Y-axis assembly from the Prusa website. However, I still get the same message during calibration. One thing I noticed is that there is a adjustable Y-axis belt holder that could solve the issue, yet my Y-axis belt holder does not allow adjusting.

Does anyone know how i can solve this issue. Do I need to get an adjustable Y-axis belt holder from PRUSA or no?

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This was the first major issue I fought with mine, got the same error about not reaching the front points. I finally got past it by ignoring the 100mm thing figuring I wasn't measuring from exactly the right spot, nor did I have professional calipers anyway just a yardstick with metric. I'd watched it doing the calibration and saw that it wasnt aligning over those spots the way it should, the bed wasn't going far enough up, so I flipped that sucker over and started looking at it. I realized that for the bed to physically go far enough up for that spot to get right, I'd need to move my Y frame physically backward in the frame a bit. What had been getting me was that black bracket connecting the power supply; it was preventing me from going far enough the other direction. So I loosened the M12s - the 2 counter-nuts - and tried using a bit of extra force to see if it would bend without breaking. It did "give me some give" and so I moved it the 3-4mm I thought I was lacking and tightened everything up and then had to move the other side (much easier without power supply) the same amount so as not to screw up my perpendicular, and eventually got the XYZ to do. Never was I so happy to see a Congratulation message! Good luck getting past nozzle height; this is the next step after this one and it is now kicking my butt.

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I am experiencing the exact same issue. I measured everything with calipers and it's still off. I re-verified every step in the manual that could impact this axis. The only thing I can think is if one component is manufactured a little different... Hot-end carriage location of probe, end-stop or its holder, or the belt positioner that hits the end-stop. I'll try pushing the axis pasts 100mm and see if it helps like it did for @blackfox42

UPDATE 1: I just adjusted what @blackfox42 had suggested 2mm past what the manual says and it calibrated first try. Seems like an opportunity in the build instructions/power supply bracket size.

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Woohoo! My God, I was useful for once! Glad to hear this - did you get past the Mesh Bed Level that prefaces every print when trying to do your V2calibration Gcode print to get the nozzle height right? I am stuck there, currently.

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I haven't had any issues with the mesh bed leveling or the calibration. I switch filament often so the Live Z axis adjustment is amazing for tuning things perfectly before a print. I have the sensor adjusted exactly as they say in the instructions with the top flush with the bottom of the wire guide.

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I've done that and it still stops, so I am starting to suspect my Y axis/bed movement. While the Y moves fine during XYZ calibration and passes it many times now, I get hung on the 9 point check, which I think is that Mesh Bed Leveling, on point 3 - after point 3 it gives a motor sticking kind of sound and then stops with the error "Bed leveling failed. Sensor didn’t trigger. Debris on nozzle? Waiting for reset". I have noticed that my bed does not seem to move as smoothly as that of Joseph Prusa's on some of his videos when he moves the bed manually, or other vids I'd seen. I may look at that next time I get to work on it. I have to put a little effort into moving mine, it moves, but not as effortlessly as those guy's seem to.

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I would ensure that your slides are perfectly aligned from this step: 2. Y-axis assembly

Also, it is possible that your Y-axis belt is not tight enough. Hope this helps!

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I just received my kit and got it assembled and running tonight. I had the same issue that the Y axis limit switch would not be engaged by the Y axis belt holder. I found that the Y axis belt holder was hitting the Y axis stepper gear and keeping it from going the 3mm or so it needed. I dremeled away the 3mm and it is working fine now.

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Ishould do the same... I guess. Can you upload some pictures? Is the XYZ calibration successfull in this way?

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Nick will be eternally grateful.