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My delta is printing backwards

Posted by ybanrab 
My delta is printing backwards
March 25, 2015 03:05PM
So I'm tuning my homebuilt delta and I've got the to point where my (symetrical) calibration objects look reasonable, so I thought I'd try generating some name tags for the kids. I hacked on OpenJSCad for a evening an knocked up a nametag generator, which apprears to be operating just fine. I can import the resultant STL into Slic3r and generate GCode fine too. Pronterface renders the GCode looking correct:

When I actually print out the name tags though, I get something rather different:


Clearly, I've got something rather reversed! Has anyone else experienced this and what steps did you take to rectify?

I'm running a recent Marlin and my stepper directions are defined like so:
#define INVERT_X_DIR false // DELTA does not invert
#define INVERT_Y_DIR false
#define INVERT_Z_DIR false

Thanks very much in advance

Barny

P.S. Here's the machine:

Re: My delta is printing backwards
March 25, 2015 03:21PM
I'm pretty sure you have towers X,Y & Z in the wrong order.

As I understand it they go counter-clockwise and if setup in the (to me) more natural clockwise style, you will get mirror image prints.
Re: My delta is printing backwards
March 25, 2015 03:27PM
Thank you! You're absolutely right, I've just checked and mine are clockwise (as viewed from above) so that's most likely it! I'll swap over this evening and see what I get

Barny
Re: My delta is printing backwards
March 26, 2015 07:30PM
Front left is X. Front right is Y. Rear is Z
Re: My delta is printing backwards
March 26, 2015 09:22PM
Just swap the X and Y stepper motor and endstop connectors. No reason to over-think it any deeper. Been there, done that, printed reverse threads on several parts before I caught the mistake..... sad smiley
Re: My delta is printing backwards
March 28, 2015 10:47PM
Which Delta model is this one out of interest?
Re: My delta is printing backwards
March 29, 2015 01:05PM
It's an own design job, largely laser-cut from MDF sheet, as I didn't have access to a 3D printer to create parts. Design files and a few notes are here: [github.com] but I do need to update a few parts, based on the experience of building it.

I had lots of influences form others on this forum, particularly some of the ideas form AndyCart's printers, so massive thanks for sharing.

Thanks

Barny
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