Hello,
Any tips how to solve a small problem with s30 pro. When i try to frame the steppers are loosing steps. And it stops when he wants 
Already checked the belts…looks like a software problem…
New machine or older machine, new problem?
Stops same place or random?
Look for binding in the travel. Do the Sculpfun “tilt Test” to see if the parts move freely under their own weight.
Not likely a software problem.
Can you enter $$ into console and paste results?
How are you determining this?
There’s no g-code command that would say anything like “lose steps here”.
The most likely cause for lost steps is something mechanical. You’ve already checked belts but I’d suggest doing a full mechanical review to make sure that you don’t have lost motion somewhere else. Check pinion gears as well.
It could be that your speed settings are too high but this is typically mitigated by the maximum speed configured in your controller.
Have you made any changes to GRBL configuration or any hardware modifications to your machine? Specifically, have you added anything that would increase the mass of the laser assembly?
Machine is stock, worked like a charm untill today. It stops randomly on table. Its like its going out of bounds.
Or like it stopped getting commands from the PC?
Target buffer size found
ok
$$
$0=10
$1=25
$2=0
$3=4
$4=0
$5=1
$6=0
$10=1
$11=0.010
$12=0.002
$13=0
$20=0
$21=1
$22=1
$23=7
$24=200.000
$25=3000.000
$26=250.000
$27=2.000
$30=1000.000
$31=0.000
$32=1
$41=0.000
$40=0.000
$100=80.000
$101=80.000
$102=250.000
$103=100.000
$104=100.000
$105=100.000
$110=6000.000
$111=6000.000
$112=1000.000
$113=1000.000
$114=1000.000
$115=1000.000
$120=1000.000
$121=1000.000
$122=1000.000
$123=200.000
$124=200.000
$125=200.000
$130=410.000
$131=400.000
$132=200.000
$133=300.000
$134=300.000
$135=300.000
ok
If I disconnect it works like a charm. I will try to put a fresh one after new year and see what happens.
Are you saying that if you unplug the laser, everything works?
If i unplug the 3 pin connector from the laser works 
Is your laser on it’s own power supply or part of main power?
Only thing that makes sense is a power fluctuation.
Sculpfun use a 12v with 7amp power adapter, from that takes all the power tru controller-laser-steppers…
I second this opinion. The laser is a substantial load on the power supply.
With the laser unplugged, the power supply has enough reserve capacity to absorb the fluctuation.
The laser head and connector don’t look good. I’d recommend doing a full cleaning and checking if it works better. Either the connector or the laser head control board might create a short somehow.
The laser head works great on another s30, probably the cable is the problem. I will pin another after new year.
The problem was from the power supply. 