Marlin upgrade - Z axis steps problem

Re: Marlin upgrade - Z axis steps problem

Egar — Mon, 03 Feb 2014 00:51:10 -0500

Ok, after disconnecting and reconnecting everything, trying motors and drivers independently, I got it working again thanks to your help guys, thank you very much! I adjusted both the acceleration and the feed rate. The feed rate is what did the trick. I reduced it from 5 to 2.5 and now the motors move again -apparently- correctly.

So, it works, but I still don't know why it worked before. Does this mean something broke? Anyway, I'm going to try my first auto-leveled print now. Wish me luck!

Thanks again, cheers.

Re: Marlin upgrade - Z axis steps problem

cat.farmer — Sun, 02 Feb 2014 12:51:58 -0500

Do they both work separately? If so ot may be your current setting on the driver.

Re: Marlin upgrade - Z axis steps problem

Egar — Sun, 02 Feb 2014 11:52:52 -0500

Hi guys,

Thanks for the answers. I'm going to try changing both settings, but I think there's something else broken because I re-uploaded the old version of Marlin to the arduino and the problem persists.

I think the driver is busted, or a wire got cut. It's weird though, if I leave one motor connected, it moves ok, but when I attach the second one they both do the thing I described initally.

Has anyone seen this problem?

Re: Marlin upgrade - Z axis steps problem

daveb500 — Sun, 02 Feb 2014 09:51:07 -0500

I had the same problem when moving z in -. It would stop and buzz. The feed rate in MArlin was set at something like 500 mm/min. I changed this to a max of 125 mm/min and now it runs fine in both directions.

Re: Marlin upgrade - Z axis steps problem

cat.farmer — Fri, 31 Jan 2014 23:40:02 -0500

Sounds like your acceleration is too high. That setting should be in the same area as the steps.

Marlin upgrade - Z axis steps problem

Egar — Fri, 31 Jan 2014 20:31:59 -0500

Hi guys,

I updated the Marlin version on my Prusa i3 because the version I was using didn't have support for autolevel bed, and since I installed it already I'm really really looking forward to try it out :)

The problem is that, even after editing Configuration.h to look like my old version except for the new features, my Z axis is not behaving properly. If I try to move it up by 10mm, it moves something like 2mm very fast and then the motors stop and get noisy. It's as if my DEFAULT_AXIS_STEPS_PER_UNIT were too high for the Z axis, but this is the calculated value :S Weirdly, this is a very similar behavior to when I had forgotten to set the jumpers for 1/16 microstepping.

#define DEFAULT_AXIS_STEPS_PER_UNIT   {78.4313, 78.4313, 4000, 625.7068}

Those are the values that worked perfectly with the older version (I'm using M5 rods, 200 steps Nema 17), but now they only seem to be working with X, Y and E.

Any ideas? Any help will be greatly appreciated.

Cheers!