sudden drop in table during print

Amorese128 · Post by **Amorese128** » Sun Sep 27, 2015 2:12 pm

Can anyone tell me why the print table drops suddenly during a print? I replaced the mother board, sd card reader.

Matt_Sharkey · Post by **Matt_Sharkey** » Sun Sep 27, 2015 2:24 pm

inclued in your startup gcode

M84 S0 ; don't let go of motors

if this isn't provided then the bed motor will time out after not moving for 5 minutes, which is probably the duration of the first layer.

Jules · Post by **Jules** » Sun Sep 27, 2015 2:51 pm

Is it dropping after the print finishes, or in the middle of the print? How far does it drop?

If it is dropping after a print finishes, you can add a bit of G-code to the ending Script to take it down closer to the bottom before it cuts power. I use this code in the Ending G-Code tab of S3D:

M104 S0 ; turn off extruder
M140 S0 ; turn off bed
G91 ; relative mode
G1 Z10 ; lift 10mm
G90 ; absolute mode
G1 Z190 ; drop Z axis to just above spring
G28 X0 ; home X axis
M84 ; disable motors
M106 S0 ; stop bed fan
M108 S0 ; stop extruder and electronics fans

sthone · Post by **sthone** » Sun Sep 27, 2015 4:37 pm

Are you printing from USB or the SD card when the drop happens?

-Steve

Amorese128 · Post by **Amorese128** » Mon Sep 28, 2015 12:21 am

The table drops after the first layer. I just started having this issue. It only drops 1-3 levels hot end continues going as if nothing is wrong. filament everywhere.

Amorese128 · Post by **Amorese128** » Mon Sep 28, 2015 12:23 am

I am printing from USB I also have a issue with SD card. I have several files on the SD card however when I click on print from SD card nothing shows up. I just replaced the mother board and SD reader. The files are still on the card because when I place SD card in my computer they are there.

jsc · Post by **jsc** » Mon Sep 28, 2015 12:29 am

Regarding the table drop: that can happen when the stepper loses a step for whatever reason. Perhaps you have an intermittent wiring issue, or perhaps you are over extruding and the nozzle is contacting part of the print and being pushed down? I've had this happen when I tried to print with a tall print already on the bed that ran into the gantry. It can also happen under fast Z travel moves if you haven't lubricated your Z rods in a while.

Regarding the SD reader, are you super sure you have it wired in the correct orientation? Also, your SD card must be formatted as FAT, perhaps it is not?

MagicEngineer · Post by **MagicEngineer** » Sat Oct 03, 2015 3:49 pm

I had this exact issue. At first I thought it was just a z axis calibration problem, but after resetting the z axis 3 times in 3 days I realized there was the deeper issue. It turns out that the screw holding the hot end in was slightly loose. This caused the hot end to slowly push out and hit the bed.

Amorese128 · Post by **Amorese128** » Sun Oct 04, 2015 2:16 pm

Ok help anyone I have replace everything motherboard, SD reader, hot end. Yet when I print the table is continuing to drop during a print ruining the print and losing a lot of filament in a big ball of nothing. I leveled the bed and the hot end is not touching the bed anywhere can anyone out there help?

Amorese128 · Post by **Amorese128** » Sun Oct 04, 2015 2:19 pm

Can someone also answer why I cannot print from my SD card. My M2 is not recognizing the card and I get a error issue. There are files on the card because when I place it in my computer the files are there. When placed in the M2 they are gone.

sudden drop in table during print

sudden drop in table during print

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sd card reader