Adjusting the Z height with the EEPROM and saving.

[Youngjedi]

it was fairly cheap. I also found that it "over runs" a couple degrees. For example, my straight up and down is 155 in the servo support in Marlin configuration H. Using prionterface, I select m280 p0 s155 and the servo actually goes beyond like 157-158. If I run the command again, it straightens out to 155. If I repeatedly run the command, it "shakes". So, I was wondering what would be a good servo. I found this one on adafruit. https://www.adafruit.com/products/1143

any thoughts?

[uncle_bob]

Hi

Back when I did my ABL stuff, I bought a variety of servos at a variety of prices. Eventually I found some expensive ones that did not randomly bounce around. They still had temperature sensitivity in my setup. I spent some quality time on the R/C forums digging into what others had seen on the same servos. Unfortunately that was after I had bought the majority of them. Seems that a lot of people see the same things on the same servos ...

My ultimate decision was that a fairly expensive (3X the price) servo was the way to go and that warming everything up for "a while" was part of what had to be done.

[Roxy]

So, I was wondering what would be a good servo. I found this one on adafruit. https://www.adafruit.com/products/1143

any thoughts?

All of the Tower Pro servos seem to jitter. Out of desperation, I bought different ones from different vendors. This one seems to work without jitter: http://www.ebay.com/itm/262564045761...%3AMEBIDX%3AIT

[Youngjedi]

Odd with the jitter. I use the exact same model servo on my makerfarm 10 and it works fine after I set the power delay to 300 in the ramps configuration. for some reason, the Pegasus 12 has an issue with it. I am going to isolate the wiring from the servo to the ramps from all the other wires to see if that helps. Hopefully just adding a ferrite ring may do the trick as well.

Thanks Roxy for the Link...I'll check it out.

[uncle_bob]

Hi

I would spend time grounding the printer frame and the rest of it before I'd go crazy with common mode chokes.

Bob

[Youngjedi]

Well, It took an hour after I got home from work, But I think I solved it. My original config was to do the abl at the extended 155 servo number. Also turn off power to servo 300 Ms. After fussing around with it, I began to think that the servo was "overshooting the 155 mark by about 3 degrees. I said "to hell with the jitter, I don't care. I disabled the servo off command so there would be power to the servo all the time. I tried again and (with the jitter) it was still overshooting. I began to realize that maybe it's not overshooting, maybe that wrong angle is actually 155. So I changed it to 153, And ran 4 g29 commands. The servo jitters ever so slightly, but it is holding the correct position throughout the abl.

doing a test print now and it is looking great so far.

I want to thank everyone who help chime in on this. It took me in directions that I did not think about. If the print turns out nice, I'll post a picture.

This is a great forum (Makerfarm)...I hope more and more people join. Colin has a great product!

Charlie

Update....I printed an r2 cookie cutter. The ABL worked perfectly, and the print came out absolutely perfect. Being a cookie cutter, printed at a medium definition...nothing special.