I’ve got a new one that is driving me up the wall. 90 percent of the time I do a g28 I have the head crashing issue in the video.
I’ve tried different firmware, checked that all my movements are tight and slop free, and swapped stepper drivers.
Anyone have any ideas?
Hmm while it looks a bit similar and I do have FSRs, I don’t have them hooked up nor am I running firmware that support z probe.
Most recent attempt to fix this I’ve replaced the controller with a different one and swapped all the drivers around again. Same thing but now its only 10% of the time.
I haven’t had this problem in the year I’ve owned this delta until this week. 
So it happened again, this time I had all arms less than 20mm from the end stops. It completes a G28 but does it one arm at a time.
Check the pins for the motors, I dimly remember seeing something like this and it was a wiring fault in either the motors or the end stops.
I do not know this machine and have only used Mach 3 CNC software on a 4 axis mill.
But here goes, does this crash happen with all the scripts you run, or just the start-up position or end position of the machine?
It really looks like one of the start position codes are coded wrong and it’s telling one stepper to start high, did you try and re-write, tweak the repetier code? It’s one line per command, did you use all the right variables?
Someone else will have to help you with that, lots of great blogs out their if you do not get a response here.
If none of the above, lose/dirty connections, then test as close to the motor possible is it receiving the full voltage, hook up a meter beforehand to one of the motors not moving.
Also test your wall outlet voltage is it surging high/low a good surge protector can help, but ultimately you have a bad shorting breaker to that plug: this will damage electronics up to and including burning them up!
I’ll run that before I home each time and see what it says. Currently its reporting all as open and everything is working.
@Mark_Andre_Halle
Now that you mention it, all I’ve been doing is running calibration scripts. Here is the one that causes the most issues. Its to calibrate my y motor.
G28
;Go to Y
G0 X56 Y-34 Z0 F8000
@Wes_Brown you have x and y on the same line, one line one command
@Wes_Brown I did a quick search this is a nice site, for C and M code:
@Mark_Andre_Halle is the winner! Thanks for your help!
Check endstop readings. M114? Perhaps all 3 motors are not raising because it thinks one or more endstops are triggered