Circles are rounded squares

I already have some finely tuned to the Orca Mendel. A test block 20x20X10 mm is now within the required dimensions. The Y step from 40 to 42 put in the firmware.
But circles, who want to really fail, they are more rounded squares. The inner layer does not look that bad, but it is just the outline so that stands out.

Have you checked the GCode you are using? If the GCode shows no Y axis movement when the X-axis is printing a side, then check to see if the Y-axis is locked during that move. Depending on the firmware, it may or may not lock non-moving axes.

JB

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Check out my blog: AdventuresIn3-DPrinting

The Gcode looks correct, I try different settings and play with the settings of Skeinforge (Stretch ect.) But I have always the same problem. The filling looks like a circle, but the outside edge is the problem. To explain it beter, I've publish a picture on http://www.mouwy.com/circles

I use the firmware for GEN6 from http://www.mendel-parts.com/downloads/firmware/Marlin/2011-08-13_Marlin_v0-9-0_Orca_new_optos.zip

I see not locking during the move.

The Gcode for information:
G90
G21
G92 X0
G92 Y0
G92 E0
G1 X8.0 Y6.0 F1000 E2
G92 E0
G92 X0
G92 Y0
G90
G21
G1 X11.02 Y8.72 Z0.32 F4500.0
;0.0
G92 E0
G1 X13.04 Y7.18 Z0.32 F1440.0 E0.1524
G1 X15.38 Y6.2 E0.3049
G1 X17.91 Y5.87 E0.4573
G1 X20.43 Y6.2 E0.6098
G1 X22.78 Y7.18 E0.7622
G1 X24.79 Y8.72 E0.9147
G1 X26.34 Y10.74 E1.0671
G1 X27.32 Y13.09 E1.2195
G1 X27.65 Y15.61 E1.372
G1 X27.32 Y18.13 E1.5244
G1 X26.34 Y20.48 E1.6769
G1 X24.79 Y22.5 E1.8293
G1 X22.78 Y24.05 E1.9817
G1 X20.43 Y25.02 E2.1342
G1 X17.91 Y25.35 E2.2866
G1 X15.38 Y25.02 E2.4391
G1 X13.04 Y24.05 E2.5915
G1 X11.02 Y22.5 E2.744
G1 X9.47 Y20.48 E2.8964
G1 X8.5 Y18.13 E3.0488
G1 X8.16 Y15.61 E3.2013
G1 X8.5 Y13.09 E3.3537
G1 X9.47 Y10.74 E3.5062
G1 X11.02 Y8.72 E3.6586
;3.6586
G1 X11.33 Y9.03 Z0.32 F4500.0
;3.6586
G92 E0
G1 X13.25 Y7.55 Z0.32 F1800.0 E0.1456
G1 X15.5 Y6.62 E0.2912
G1 X17.91 Y6.31 E0.4369
G1 X20.31 Y6.62 E0.5825
G1 X22.56 Y7.55 E0.7281
G1 X24.49 Y9.03 E0.8737
G1 X25.97 Y10.96 E1.0194
G1 X26.9 Y13.2 E1.165
G1 X27.21 Y15.61 E1.3106
G1 X26.9 Y18.02 E1.4562
G1 X25.97 Y20.26 E1.6019
G1 X24.49 Y22.19 E1.7475
G1 X22.56 Y23.67 E1.8931
G1 X20.31 Y24.6 E2.0387
G1 X17.91 Y24.92 E2.1843
G1 X15.5 Y24.6 E2.33
G1 X13.25 Y23.67 E2.4756
G1 X11.33 Y22.19 E2.6212
G1 X9.85 Y20.26 E2.7668
G1 X8.92 Y18.02 E2.9125
G1 X8.6 Y15.61 E3.0581

I found the solution!
I've activate Lash in Skeinforge. X Backlash (mm): 0.2 and Y Backlash (mm): 0.4

mouwycom Wrote:
-------------------------------------------------------
> I found the solution!
> I've activate Lash in Skeinforge. X Backlash (mm):
> 0.2 and Y Backlash (mm): 0.4

I have the same problem , but in the java software i don't find the Lash settings...