I’ve had a Qidi Tech dual for about 2 weeks printed about 6 items of various sizes and it has suddenly started making a dreadful grinding (or juddering) when it reaches its x, y or Z limits anyone got any ideas ? When I jog forward in y axis and press the y micro switch it stops but when I jog - y and hit the limits it doesn’t stop and makes the noise and judders… When it hits - x limits it judders when it hits +x limits it judders in certain positions in the y axis… Please help I’ve seen other threads the same but they never came to a conclusion
One possible cause is a cable to one of the stepper motors is bad. First thing to do is contact QIDI and tell them about this.
I have one as well. The sheet metal tends to be out of tolerance as the extruded will bump against it. There are a few logical fixes for the rubbing. One, take a pair of pliers and bend back the sheet metal that is getting in the way. Two, take a dremel to it and cut away at the parts that are hanging in the way of the extruded. Third and last, you could always try for a refund because of bad manufacturing. I had the same problem and opted for the second solution. Hope that helps.
Thanks for the replies, I’m already talking to qidi about this. I don’t think it’s quite like yours"sarnsdev" my noise is definitely because the machine is trying to carry on moving when it’s hit the end of its travel instead of stopping when the limit switch is activated. The switch is definitely being activated because the little red light on the switch comes on. Also there is only 3 limit switches 1 for each axis… What stops the machine on the other end of the stroke where there isn’t a switch? I keep thinking it’s a software thing because it happens at the end of each axis stroke. Surely every cable cannot have gone down at the same time?
What slicer are you using and what printer profile is selected?
I was using simplify3d and I selected qidi tech 1. I printed quite a few parts with it no problem then I selected the cancel button on the machine itself because an abs print I was doing started to lift. And when you cancel on the qidi it returns to the home position and this particular time in the corner where it normally stops it carried on trying to move hence the horrible juddering noise of the motors trying to keep moving the head… Now if I jog the machine to its limits the xyz movement is totally fine until it hits the limit switch stop or in the opposite direction the limit of the machine then the juddering kicks in because it thinks it can still keep moving. That’s why I think it’s a firmware thing
Shouldn’t be firmware. I would swap limit switches with the x -y and see. Then I would change cables to see if that makes any difference.
Try this.
1. Move the gantry so it is all the way to the front and all the way to the right against the limit switch for the X axis. Run a “home” from the control panel. What happens?
2. Move the gantry all the way to the back against the Y axis limit switch and all the way to the left. Run a “home” again and see what happens.
Also I would reset S3D via the help section, it is something like restore defaults then re-select the printer. S3D gets messed up at times.
I will try those ideas when I get home from work. I think I’ve done everything but that exact description. When ever I’ve pressed the home button when the heads in various places it travels fine until it gets in the corner, then the motors keep trying to move the head hence the juddering. Thanks for your help
What this may show is which one is the issue. If the gantry is already at the Y stop and no noise until the extruder gets to the X stop then the X is suspect. Likewise if the extruder is against the X stop and no noise until the gantry gets to the Y stop then the Y is suspect. The idea is to limit the movements of each to isolate when it has an issue.
And you can push the bed all the way down at the start of each. The gantry should hit its mark before the bed does so watch the bed also.
I like the logic and will try. When I put the head in the middle of the table and jog 1 axis at a time into its corresponding side plus or minus it judders and tries to drive through it. And it does that on every axis. Here is a question I couldn’t answer, the micro switches are only at 1 end of each axis. What stops the head normally on the other end without the micro switch? Is it the firmware that knows it can only move so many mm in that direction?
Hello,
It sounds like the printer is trying to go past the limits and the belt notches are jumping over the teeth in the gear.
Reduce the model size so that it is not past the border limits. You might want to calibrate the printer for the bed size again.
I found that it can also try to print off the side of the print bed, and that is when it will try to go past its limits.
Roger
Hi Roger It’s doing this when I press the home button actually on the printer or when I cancel a print or when I press the level bed button. Any built-in routine which maxes out 1 of the axis. Do you have a Qidi? Is there a bed size calibration that can be done? I didn’t know if there was one. All my prints have been small and in the centre of the bed
No, there is no “bed calibration”. The bed size and offsets are entered into the slicer. Picking the QIDI Tech-1 profile in S3D will have the parameters already in it.
Your issue does seem to be mechanical. If it is not a switch then a cable is the most likely. A bad board is possible but I would think there would be bigger issues if that were the case.
Has QIDI had any suggestions?
If you aren’t on it check out the group on facebook search for QIDI 3D. Lots of help there also.
Yet again thanks for the input, I agree with what you have said I’ve got a spare switch and cable so I can do some tests, I’ve ordered some more as well as spare motor cables . I’ve just submitted my request on the Facebook group. It looks like qidi are sending me a new printer which has shocked me. But I still would like to bottom this problem so ice learnt something.
I’ll get the facebook request later when home.
QIDI support is extremely good I have found.
Unless it is a bad board it is easily solvable. But trouble shoot with with a process of elimination starting with the most obvious.
i.e. we are pretty sure it is not a motor cable. Then use my steps to determine if it is related to a specific axis and that switch or cable. Is the switch actually being contacted? One thing at a time. This method will apply to trouble shooting print issues as well.
Hello,
Then, I suggest that you reduce the size of your object in the slicer software view. That will reduce the size of your object on the print-bed, and that will stop the issue.
Kind regards.
RDS2
I tried to print a test print which qidi sent me which is a small cube in the centre of the bed. As soon as I try and print by pressing the print from sd and selecting the file it does its normal routine of trying to home all the axis in far right corner then it just starts juddering when it gets to the corner. So no programs can be run.
Hello,
I think it is about time that you contact QIDI tech help.
It almost sounds like a programming or electricial problem.
RDS2
I have the QidiTech Dual as well. I experienced the same thing after I made a change in the program in the utilities settings reference “Speed Up,” if I recall correctly. I was trying to solve the first layer intermittent extrusion that I see others have as well. When I turned that Speed Up setting to “OFF”, and then tried some prints, it became very loud juttering noise at x, y , z and I thought the printer was about to shake apart. I went back in and turned that Speed Up setting back to “ON” and it fixed the shuttering noise. Still have not solved the intermittent first layer issues. Maybe someone can help with that? Or point me to a good thread… Hope this helps someone.
