Hot end Slamming into the rails...

[clothespinguy]

My v3 was printing perfectly fine until yesterday when the hot end started scraping against the printed part just over by the Z rail. After a few layers of scraping like that suddenly the hot end just kinda floated up a few inches and started printing in mid-air before I cancelled everything. Come to find out, the co-worker that put it together had twisted the belt on the Z rail a full 360 degrees when assembling it.

I fixed it but the belt has some visible wear along one half of its width, but it seems to hold tension just fine and has enough teeth to still grab the gears. But now when I try to calibrate or even send the G29 command the hot end goes to the X rail, travels down and taps the bed, comes back up and slams itself into the X rail really hard. Here's the code below. Any suggestions???

->G29

<-ok 0
<-
<-TargetExtr0:0
<-
->M114

<-Transformation matrix: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000
<-
<-SpeedMultiply:100
<-
<-X:0.00 Y:0.00 Z:100.000 E:0.0000
<-
<-read reg 49 value: 106
<-
<-read reg 53 value: 0
<-
<-read reg 57 value: 0
<-
<-read reg 45 value: 8
<-
<-read reg 49 value: 21
<-
<-read reg 53 value: 0
<-
<-read reg 57 value: 0
<-
<-read reg 45 value: 2
<-
<-Z-probe state:L
<-
<-zprobing...
<-
<-Z-probe state:L
<-
<-Error:Z-probe failed
<-
<-read reg 49 value: 21
<-
<-read reg 53 value: 0
<-
<-read reg 57 value: 0
<-
<-read reg 45 value: 10
<-
<-read reg 49 value: 21
<-
<-read reg 53 value: 0
<-
<-read reg 57 value: 0
<-
<-read reg 45 value: 2
<-
<-Z-probe state:L
<-
<-zprobing...
<-
<-Z-probe state:H
<-
<-Z-probe:121.45 Step Variation from Probe to bed Distance:8116.00 X:-123.56 Y:-71.34
<-
<-X:-123.56 Y:-71.34 Z:-301.650 E:0.0000
<-
<-Error:B hit floor
<-
<-Warning:Invalid delta coordinate - move ignored x:-9885 y:-5707 z:-14400
<-
<-Warning:in queueDeltaMove to calculateDeltaSubSegments returns error.
<-
<-Warning:moveRelativeDistanceInSteps / queueDeltaMove returns error
<-
<-Z probe (X Tower) failed on sensitivity: 20
<-
<-read reg 50 value: 20
<-
<-Setting Probe Sensitivity To:22
<-
<-read reg 50 value: 22
<-
->M105

<-SpeedMultiply:100
<-
<-X:0.00 Y:0.00 Z:100.000 E:0.0000
<-
->M105

[djarmag]

one side might be tight but the other might be off, try taking the Z carriage off the ball joints, place it on the bottom of the platform, take the top belt holder off and check the routing path of the belt, retension and lock into place.

Another could be software related because mine did that when I loaded the wrong file into the profile. I had to clear EEPROM and reload default.

[clothespinguy]

Support helped me out, problem solved. The EEPROM settings somehow got out of whack so here was the procedure they recommended (and now the printer works perfectly again).

Please send M502 via the terminal window that will reset the EEPROM to defaults
Then send M500 that will save the settings.

Then you will need to re-calibrate the printer running G29. If firmware does not take G29 for calibration, it is time to update your firmware:

Installing Firmware:http://seemecnc.dozuki.com/Guide/Step+5 ... irmware/50
Calibrating: http://seemecnc.dozuki.com/Guide/Step+6 ... Printer/51