Mk3 loses its home after stopping a print  

Re: Mk3 loses its home after stopping a print

would have to take a look at your start/end scripts, but is there a home-all at the beginning of your next print and if so what does it do?

Re: Mk3 loses its home after stopping a print

Thank you for responding Curtis. The problem has actually happened with the models on the included SD card. When I stop the print, the next thing I do (from the menu) is "auto home". The print head does not return to home (front left of bed) instead it does come to the front but it is somewhere towards the center or to the right.

Maybe I'm not recovering from a stopped/failed print the way I should be? Any instructions would be very much appreciated.

Cheers
Chris

Re: Mk3 loses its home after stopping a print

I had a similar problem when my printer was almost new. A new XYZ calibration solved my problem.

Re: Mk3 loses its home after stopping a print

I had a similar problem when my printer was almost new. A new XYZ calibration solved my problem.

I have done the xyz calibration numerous times because I didn't know another way of resetting the home calibration. I did eventually discover that self test does this and is much faster than the xyz. Unfortunately this has not solved the problem.

Re: Mk3 loses its home after stopping a print

Could there be any component that causes the problem.
What values do you have on the belt tension for the x and Y axis respectively?
Runs the end pulley's easily, if not, reduce the tension of the pulleys center screw.

Re: Mk3 loses its home after stopping a print

I had this problem the last two days. They were two different issues where I was setting up a print and didn't like it so I went to stop the print. I've had it work fine before, but these two separate times the extruder would attempt to go to the home position.
The two times it didn't work the print head would move to the left like normal and then the bed would start moving back so that it could get to the home position. What happened the two occasions it didn't work is it would stop some time between where I stopped the print and the front of the heat bed. Both times stopped and different locations.
When it stopped it would start grinding as if it was hitting a stop.

Re: Mk3 loses its home after stopping a print

Have you had any luck with finding a resolution. I am having the same exact problem. The printer seems like it loses its home location every time a print fails or I stop a print.

Re: Mk3 loses its home after stopping a print

I just get my new printer build up and it does this "home lose" and my printer do it every single time when i start printing...or so im feeling right now, after fighting with it over night 👿 ....But yes, after reseting printer or canceling print means losing the home also.
When printing it start normal all to the left (if i have put it in there my self) but it jumps about 5mm to the right and starts calibration..so my bed is 5mm too short for the every right side calibration point..(of course every calibration point is 5mm too left but it doesn´t matter)

Have to try to put firmware again and start over some other day. i was thinking myself, can too tight belt make this kind of problem and second guess is that can pinda be too low?

Re: Mk3 loses its home after stopping a print

I too am having this exact issue, and am wondering if any resolution has been discovered.

I ordered the brand new MK3S, finished assembly today, and the initial set up went just fine. Started printing one of the included prints on the SD card for a test, and the print failed, and lost it's home position. I reset the printer to factory settings, flashed the firmware with the latest version, recalibrated, and still get the issue when I stop the print from the menu.

My printer has even damaged itself, which is frustrating. Since it lost the home position and doesn't put the extruder back in the right place, It has slammed the fully heated extruder into my steel print sheet and warped a corner. Another time, it actually gouged the heat bed with the extruder nozzle in the same corner. I bought the $750 Prusa instead of the $200 Ender 3 for these features that are not working, and my printer is slowly destroying itself as I try to figure out how to resume printing without re-calibrating the whole darn thing all over again.

Re: Mk3 loses its home after stopping a print

Hi max.b10,

What you describe is pretty much exactly what has been happening with my i3 Mk3 the past few weeks, but since I'm so new to 3D printing I've been having a difficult time problem solving this particular issue. It ran extremely well for the first two months (I ordered and assembled it in December) and printed some incredibly beautiful models with no failures. Suddenly about a week ago after updating to the newest firmware I began having trouble with the printer losing home and beginning calibrations around the middle to back left corners and subsequently "crashing" or grinding to a halt when the bed moves too far forward. When trying to move the bed manually from the screen I am only able to move is slightly in a single direction. For example, even though the bed is centered it can only move forwards not backwards, since the bed location is registering as 0. Additionally, the bed was getting way too hot and prints were peeling as well as a few other odd issues that hadn't happened before.

At first I assumed it was corrupted firmware, so I reverted to 3.5.1 but all the issues still kept happening (even if I didn't manually stop the print), so I did a factory reset and re-calibrated. Just to do my due diligence I also checked and tightened the belts which are now at near perfect/recommended tension (although I tend to have a lot of stretching in the X belt fairly often). As recommended by others above, doing a self test usually fixes the issue, but not always, so I'm not entirely sure whether its a hardware or software issue at this point.

I ordered the new mk3S printed parts so instead of dismantling everything now, I'm hoping that installing these and trying the firmware update again might solve some issues. I'll update after but any help or insight/advice in the meantime is so appreciated :).

Re: Mk3 loses its home after stopping a print

Brand new kit mk3s here; the printer will no longer auto-home the x-axis. The x carriage can move freely, the belts are properly tensioned, the prints look great, but the only solution to get it to home is to turn the printer off, manually move the x carriage all the way to the left (towards the stepper motor) so that when it auto homes it actually hits the far left stop.

If I use auto home anywhere else it just moves about 25 cm left a few times regardless if there's anything there to bump into. It's quite frustration to be honest.

Re: Mk3 loses its home after stopping a print

I'm so glad I found others with the same issue! It took me a while to figure this out, but when I stop a print from the interface, the extruder does not home all the way to the left on the x-axis!!!. Subsequent prints fail when calibrating because the x-axis is in the wrong "spot". My current fix is to shut off the printer, move the extruder all the way to the left, and turn it back on again. Super annoying. Sounds like a bug to me.

Re: Mk3 loses its home after stopping a print

If you stop a print by pressing the X button, you are resetting the printer to a power on state.

Generally, you want to stop prints using the menu: press the round control knob, navigate down to the PAUSE or STOP, as appropriate. Press the round knob again.

Any chance this is what's happening?

Also - what is showing up in the diagnostic screens? Do you see any crashes reported ??

Re: Mk3 loses its home after stopping a print

Yes I have the same issue and I get the same issue even using the stop print!!!

RE: Mk3 loses its home after stopping a print

Any updates on this, I've had it happen about 5 times recently, either using Cancel print via Octoprint, or using the on printer controls, each time it totally loses the XY home position and requires re-calibration, surely it has to be a Firmware issue

RE: Mk3 loses its home after stopping a print

You might want to review your gcode to ensure there is a G28 command at the beginning.  Or, if you are running something via USB is that software is sending the proper home command at the start of a print. 

FYI: Neither Stop Print nor the Panic button "home" the printer. 

RE: Mk3 loses its home after stopping a print

Same issue here.

Support keeps pretending they do not know about it.

RE: Mk3 loses its home after stopping a print

RE: Mk3 loses its home after stopping a print

Had anyone found a fix for this? It's happening to me.