So my delta printer is making parts 3% too large which is most likely

3D Printing
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1

So my delta printer is making parts 3% too large which is most likely due to wrong diag rod length in the firmware. The question is: does the length of the rod relate directly to the size of the part. So if the parts are 3% too big should I raise the diag rod value by 3%?

2

I don’t know much about Delta’s but it could be the rods like you said. If you can edit the firmware dial the size back or edit your slicer settings.

3

Have you measured the error factor in all three dimensions? Is there a 3 percent error in only one direction, two, or all three? I don’t have a clear and succinct answer, but it would be a good idea to determine the scope of the error.

4

3% in all dimensions

5

Except z

6

That would be a good place to start. Change it and see what happens. My K800 delta is off a bit too. I just rescale my models to compensate.

7

I have been rescaling my model but it’s those times you forget to change the scale that get really annoying. Especially when the parts need to be the right size

8

The problem I see now also is that the height would change also when it’s only x and y that need to change… That’s if you scale vs change the settings correctly

9

here’s an interesting document regarding a process to calibrate a delta:
http://grauonline.de/wordpress/?page_id=1118
even though it’s a dot de site, it’s in english, without a lot of technical jargon and appears straight forward but that’s easy for me to say.

10

I agree Ryan. Just admitting Im lazy. Lol

11

The math is complex. I doubr it is exactly 3%. I would suggect measuring the distance between the point of pivot for all 6 arms and also the distance between the points of pivot on the effector and the center of the effector. I do not know what firmware you have or where in the firmware you would find the values to adjust or why the distance would be off in the first place. Good luck.

12

I used a pre setup repetier firmware for this printer and somewhat measured the rods which ended up being different than the provided values in the firmware I used. I would measure more accurately but that would mean taking 6 arms off and re calibrating everything else once that is done

13

All these types of values are stored in the configuration.h file for repetier firmware. Originally the printer had Marlin but that didn’t want to work too well with my repetier server

14

I despise repetier. At least repetier host.

15

Repetier server is pretty cool. Basically sets up a website you can access anywhere for your printers and print/control/watch your printer

16

If your firmware and rod length doesn’t match, you’ll get incorrect dimensions. I learned this first hand from my Ares. (Sign in - Google Accounts) As your build is larger than G-code, your rod is longer than firmware settings. However, discrepancy in print size and that in rod size are not the same percentage. It is best to find the parameter in firmware that needs to be adjusted. (In Marlin, it is DELTA_DIAGONAL_ROD.)