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Offset Position Problem

Posted by hotcoffee 
Offset Position Problem
March 11, 2019 06:23PM
Mac OSX Sierra

Slic3r 1.3.0 through Repetier-Host

Printers: Two Prusa's built from kits 3yrs ago

Offset does not seem to be working as expected.

Reference: No problems using Simplify3d.

Having trouble with the offset position - it seems to:

• Correctly goes to Home position (at -13.5, -31)
• Correctly does what my Gcode Script tells it to do (same script I use in Simplify3d)
Not-Correct; starts print at wrong location
It prints at approx 31mm below bed center and 10mm to left of center.
I tried using Positive and Negative values but, it acts
as if ignoring the 31mm and 10mm.

Any advice/comment? Thank you

FYI - this is my script:
M109 S230 ; wait for extruder to heat
G28 ; home all
G92 E0
G1 Z10.0 F1000; up
G1 X13.5 Y10.0 F2000 ; 10.0 for e3D extruder
G1 Z0.2 F1000; down
G1 Y150.0 E8.5 F1000.0 ; prime
G1 Z5.0 F1000.0; up to clear and not drag tip

Image shows setting:

Edited 2 time(s). Last edit at 03/11/2019 06:25PM by hotcoffee.
open | download - Screen Shot 2019-03-11 at 2.07.02 PM.png (118.9 KB)
Re: Offset Position Problem
March 12, 2019 08:49AM
I think you origin is wrong. Should be the offset you quoted for home so X = 13.5, Y = 31.
The height difference between the home point and the bed is defined as a Z offset in the slicer.
This is used to generate the Gcode for the print.
Your start code doesn't afect the print unless you rezero any parameters. In your case this doesnt happen so your issues are probobly in the slicer settings.
When you state "It prints at approx 31mm below bed center and 10mm to left of center." did you mean 31mm in Y? Bellow is normaly a Z issue.
Re: Offset Position Problem
March 12, 2019 11:24AM

My use of the word, “Below”, refers to the ‘Y’axis. I could have been more clear but, since I did not refer to the ‘Z’ axis, I hoped readers would interpret correctly.

I built these (and other machines) and have CNC machines, thus, very familiar with ‘Z’ axis (and 3D printing).

Having said that, ‘Yes’, it prints 31mm below the bed center’s ‘Y’ and ~10 to Left of bed center’s ‘X’ (where, "Center" means 1/2 the bed/print area's width and length).

The image attached to this post shows Slic3r with correct Origin and Repetier with Not correct Origin.

The same Slic3r is used (have only one Slic3r installed on computer). I don't know if the problem is Slic3r or Repetier-Host...
open | download - Screen Shot 2019-03-12 at 8.12.14 AM.png (317 KB)
Re: Offset Position Problem - SOLVED
March 12, 2019 01:14PM

It turns out that Repeteir-Host doesn’t like negative numbers and uses the values in Slicer and it's own Configuration/Dimensions fields to magically do the Correct thing. Go figure... There is no Common-Sense interpretation but, changing the values to Positive took care of it.

Thus, using Positive number 31mm and 13mm (versus -31mm and -13mm in Slic3r) puts it all together so it correctly prints at location (center of the Bed)… Weird but, knowing that, I’m a happy camper

Attached shows correct settings for what I need.

open | download - Screen Shot 2019-03-12 at 10.06.17 AM.png (807.6 KB)
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