1 Topic by w_smith

  • w_smith
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Topic: SD4 home position versus bed offset?

When I try to print small things they end up printing around the middle of the bed, which is fine.

But when I print large things (or arrays of smaller things) that take up most of the (8x8) bed, the carriage runs into the Y end stop and skips steps and then tries to print off the right side of the bed.

It looks like there's an offset in the system that something knows where the bed is relative to the home position, but it's not set up right.

What are the right numbers for the SD4 and where do I put them?

Thanks!

2 Reply by mdrVB6

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Re: SD4 home position versus bed offset?

Did you try the support section on solidoodle's website?  Bed shape and offset is covered there.  Here it is:

http://support.solidoodle.com/hc/en-us/ … figuration

Anyway, if you have done modifications to the carriages, it may be slightly different.  Also, if it is printing off the right side of the bed, that sounds like an issue with the X end stop, not the Y.

SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed

3 Reply by w_smith

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Re: SD4 home position versus bed offset?

mdrVB6 wrote:

Did you try the support section on solidoodle's website?  Bed shape and offset is covered there.  Here it is:

http://support.solidoodle.com/hc/en-us/ … figuration

Anyway, if you have done modifications to the carriages, it may be slightly different.  Also, if it is printing off the right side of the bed, that sounds like an issue with the X end stop, not the Y.

I had tried the defaults, but they weren't quite right.  Part of the issue is that the X end-stop moved a bit when I installed the Lawsy carriages, part of the problem is that the extruder assembly hits the Y belt tensioners, so the usable size of the bed isn't as advertised.

So I ended up using:

[Home position is max for both X and Y]

Xmin -15  Xmax 195 Bed Left -5

Ymin 5  Ymax 200  Bed Front 5

Width 185
Depth 190

I'm trying a calibration print now, and it seems to be working...

4 Reply by mdrVB6

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Re: SD4 home position versus bed offset?

Gotcha.  In order to adjust this, just find a 20 mm calibration cube and print it centered in the bed.  Before removing it, measure the actual distance from the sides to the edge of the bed.  Then do the math and adjust as needed until what the printer thinks is the center is actually the true center.

SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed

5 Reply by jagowilson (edited by jagowilson 2015-02-25 21:21:25)

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Re: SD4 home position versus bed offset?

mdrVB6 wrote:

Gotcha.  In order to adjust this, just find a 20 mm calibration cube and print it centered in the bed.  Before removing it, measure the actual distance from the sides to the edge of the bed.  Then do the math and adjust as needed until what the printer thinks is the center is actually the true center.

This has to be adjusted in slic3r as well just to be clear. It's under printer settings. You set the (x,y) coordinate for the center of the bed there.