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Thread: Lead screw upgrade
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02-08-2015, 03:41 PM #11Thoughts on this lead screw
I think it was either Prusa himself or Triffed Hunter that argues that on a threaded rod Z you ideally have a layer height that is an even number of full steps (not a microstep). I didn't bring up the Prusa calculator, but it seems if you follow that rule you'd end up with some odd layer heights.
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02-08-2015, 04:21 PM #12
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02-08-2015, 04:38 PM #13
Yeah - I've previously joked about how when I compared the effect of metric and Imperial rods in the Prusa layer height calculator, I thought about sending Colin a thank you note for using metric rods in his printers.
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02-09-2015, 06:11 AM #14
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I agree. I remember the weird layer heights on my printrbot; in order to minimize the 'z-ribbing' effect on prints, caused the prints to be i believe 2% taller than they should have. Aside from some minimal wear on the metric rods on the MakerFarm, I've been more than happy with their performance.
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02-09-2015, 07:25 AM #15
When I was looking for solutions earlier, I had ran across that. It looked like a promising option, except for the possible issue with Imperial vs metric threads. Can you elaborate on what you mean by "much better z axis movements and resolution"? How do you have DEFAULT_AXIS_STEPS_PER_UNIT and DEFAULT_MAX_FEEDRATE set up for the Z axis? Have you had any issues with the NEMA17 motors being able to drive the Z axis?
Last edited by printbus; 02-09-2015 at 07:57 AM.
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02-09-2015, 08:11 AM #16
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I am at work now, so this is off the top of my head. DEFAULT_AXIS_STEPS_PER_UNIT is set to 2015.7 for Z, the person that designed the mod says it should be 2015.748. I dialed in 2015.7 through the front panel and have not looked back. I will have to look at the firmware tonight to tell you the MAX Feedrate. The Nema 17 motors have had no issues with driving the acme screws. I had my concerns and kept monitoring them for over heating and they actually stay cooler now than with the threaded rods. Here are a couple pics of my install, http://www.thingiverse.com/make:100198 (please ignore the wiring mess, its on my todo list to clean up )
What I mean by better resolution is that before I would randomly have tiny gaps or bad layer adhesion. I tried everything people recommended but it was random, the first 20 layers would be fine then a bad layer, then 10 more and another bad layer. and it was completely random, next print it may be 10 layers before a bad one. I was thinking it was a bad spot in the threaded rods so I replaced them with no change. my original threaded rods had a slight bow to them and that always bugged me. Now after this upgrade all those issues went away.
Like everything it seems in 3d printing this is my experience and your mileage may vary. I never liked the threaded rods with the tubing connector.
I will try and get some pictures this evening to show how it prints now, I think all the old prints are broken apart in my scrap pile.
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02-09-2015, 09:43 AM #17
I will keep this in mind as an upgrade, as I seem to have some inconsistent layer gaps, and my z rods are not straight and it bugs me, so this might be a nice update, and potential fix.
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02-09-2015, 09:49 AM #18
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What do you guys think of this product i found on amazon
http://www.amazon.com/Miniature-Qual...s=M6+LeadscrewLast edited by adamfilip; 02-09-2015 at 10:21 AM.
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02-09-2015, 10:12 AM #19
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02-09-2015, 12:07 PM #20
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