Homing settings @ zero. Extruder zips all over on run.

kpgresk

Repetier-Host Mac V1.1.0 (104) I set HOME at zero. I HOME all. I expect the present placement of the extruder to be HOME. X Y & Z home settings are black, meaning the extruder position is known to the printer.
My bed is 100 mm X 100 mm. When I RUN (on several different .stl files) my extruder goes to max Y and hangs and buries itself into the bed @ -5 Z. Are there instructions in the g-code that moves the extruder past the print start point? Seems unlikely. What am I missing? Newbie.

Repetier

You can not run stl files, you need to convert to gcode using a slicer first.
Firmware normally prohibits move to unallowed coordinates after homing so first question is why it does not.
Then you can read the gcode or just actvate log in commands to see what got send to printer to see why it does the move.
Moves are G0 and G1 commands with X, Z, Z as destination so easy to read if that move is in the gcode.

kpgresk

By saying "(on several different .stl files)" I meant different projects yielding different g-codes.
What does "translation" mean and how is it used?
Plz tell me about "offsets."
I can change g-code in the splicer listing, didn't know that.
Here are some of my first lines of code--Questions marked with ** :

6:21:30 PM: Connection opened

< 6:21:31 PM: start

< 6:21:31 PM: echo:Marlin 1.1.8

< 6:21:31 PM: echo: Last Updated: 2017-12-25 12:00 | Author: (none, default config)

< 6:21:31 PM: echo:Compiled: Apr 5 2018

< 6:21:31 PM: echo: Free Memory: 5573 PlannerBufferBytes: 1232

< 6:21:31 PM: echo:Hardcoded Default Settings Loaded

< 6:21:31 PM: echo: G21 ; Units in mm

< 6:21:31 PM: echo:Filament settings: Disabled

**< 6:21:31 PM: echo: M200 D3.00 (F dia)

< 6:21:31 PM: echo: M200 D0 (??)

< 6:21:31 PM: echo:Steps per unit:

**< 6:21:31 PM: echo: M92 X80.00 Y80.00 Z4000.00 E500.00 (Z=4000 ?? E500 ??)

< 6:21:31 PM: echo:Maximum feedrates (units/s):

< 6:21:31 PM: echo: M203 X300.00 Y300.00 Z5.00 E25.00 (Max federates seem OK)

< 6:21:31 PM: echo:Maximum Acceleration (units/s2):

< 6:21:31 PM: echo: M201 X3000 Y3000 Z100 E10000

< 6:21:31 PM: echo:Acceleration (units/s2): P<print_accel> R<retract_accel> T<travel_accel>

< 6:21:31 PM: echo: M204 P3000.00 R3000.00 T3000.00

< 6:21:31 PM: echo:Advanced: S<min_feedrate> T<min_travel_feedrate> B<min_segment_time_us> X<max_xy_jerk> Z<max_z_jerk> E<max_e_jerk>

< 6:21:31 PM: echo: M205 S0.00 T0.00 B20000 X10.00 Y10.00 Z0.30 E5.00

**< 6:21:31 PM: echo:Home offset:

**< 6:21:31 PM: echo: M206 X0.00 Y0.00 Z0.00

< 6:21:31 PM: echo:PID settings:

< 6:21:31 PM: echo: M301 P22.20 I1.08 D114.00

< 6:21:31 PM: FIRMWARE_NAME:Marlin 1.1.8 (Github) SOURCE_CODE_URL:https://github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:3D Printer EXTRUDER_COUNT:1 UUID:cede2a2f-41a2-4748-9b12-c55c62f367ff

Your thoughts?

Repetier

What do you try to show me? The log shows no commands so there is nothing to check related to the problem. See the generarated gcode from slicing especially the beginning as you said it happens on the start of print.