SoliForum - 3D Printing Community — Has any one tried...?

Re: Has any one tried...?

2013-05-12T13:57:31Z

pcm81 wrote:

Something i just thought about:
Y-axis is the only motor connected by 2 belts in series. This means the total backlash is twice that of X axis. Could be an interesting mod to try to get the Y-stepper to drive the rear axis directly; removing the 2nd belt and decreasing backlash by 2x.
I may eventually get to it, but don't want to tear up my doodle just yet; only got it this week...

I actually thought about doing just that, the easiest way I figured would be to move the stepper outside the case and put a longer y shaft with a direct coupling... but since I haven't had the time and the parts I print are well within spec it probably won't get done for a while.

Re: Has any one tried...?

2013-05-12T06:07:56Z

Something i just thought about:
Y-axis is the only motor connected by 2 belts in series. This means the total backlash is twice that of X axis. Could be an interesting mod to try to get the Y-stepper to drive the rear axis directly; removing the 2nd belt and decreasing backlash by 2x.

I may eventually get to it, but don't want to tear up my doodle just yet; only got it this week...

Re: Has any one tried...?

2013-05-11T16:30:04Z

I didn't try that. But I did go through the "perfect circles" adjustment video posted by Solidoodle and found that my backlash dropped significantly. Measured it (y-axis), uploaded lawsy's latest version of the firmware that has the "hysteresis" module and have gotten excellent results in the couple of tests I've done.

Hope that helps,
Matt

Has any one tried...?

2013-05-11T16:23:57Z

Just got my doodle3 this week. Fighting backlash etc. Couple questions:

Has any one tried to mod the doodle to use drive screws for X-Y axis instead of belts? Results?

How about adding 2nd guide rod on each side of Y axis to make belt centered between rods, like it is on X-Axis?