My first blob / evenly spaced ridges?

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My first blob / evenly spaced ridges?

Postby raimen » 2013-Sep-Fri-13-Sep

This was my first time printing with my Simple, and I am very happy with how it turned out, except for the ridges or lines that go across the print. If anybody can point me in the right direction to fix this, it would be supremely appreciated. :)
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IMG_20130920_111254.jpg
ENHANCE.
IMG_20130920_111144.jpg
Enhance.
IMG_20130920_111123.jpg
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My first blob / evenly spaced ridges?

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Re: My first blob / evenly spaced ridges?

Postby theshort » 2013-Sep-Fri-13-Sep

Did you design this? I would love to print one for my desk.
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Re: My first blob / evenly spaced ridges?

Postby Tdeagan » 2013-Sep-Fri-14-Sep

This is a Z-Axis effect. It's frequently caused by math. Really.

RetireeJay has done a fantastic writeup of this issue: http://www.printrbottalk.com/forum/viewtopic.php?f=20&t=4596&hilit=ribbing

It's not impossible that it's mechanical, if the z threaded rod is wobbling badly, that could be the cause, but read the post above for the most likely cause.
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Tim Deagan
KC5QFG
(optional Dual Extrusion) Printrbot Plus V1 [3/2013]
bed stabilizers, bed levelers, Y & X belt tensioners,
50mm fan mount, LED ring light, Z-axis screw Isolators,
Z-shaft stabilizers,optional Bowden conversion, GT2 belts/pulleys,
M8x1.25 Z Screws, Flex. Z-couplers,
RAMPS 1.4 w/ LCD,
Quick Change Extruders:
Option 1- Dual hybrid geared Wade's/Bowden w/ 3mm & 1.75mm Ubis,
Option 2 - Dual direct geared Wade's w/ 3mm & 1.75mm Ubis
Option 3 - Single geared Wade's w/ 3mm or 1.75mm Ubis
Option 4 - Single belt drive Wade's w/ E3D
MIC-6 metal bed
Thingiverse Profile: http://www.thingiverse.com/tdeagan/designs
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Re: My first blob / evenly spaced ridges?

Postby raimen » 2013-Sep-Fri-22-Sep

I did not design this, it was actually a featured model over on thingiverse, found here: thingiverse's thing:150212

Thank you for the replies! :)
I will be sure to check out the link when I get back! :)
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Re: My first blob / evenly spaced ridges?

Postby plexus » 2013-Sep-Sat-01-Sep

That amount of Z ribbing is more likely a bent or non-concentric Z threaded rod. the rods have to be straight and aligned as concentric with the coupler as possible. they should not turn and trace out a cone.
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Re: My first blob / evenly spaced ridges?

Postby Mooselake » 2013-Sep-Sat-11-Sep

The math thing, while it does exist, is often overstated and very subtle. It'll periodically insert an extra 1/2 of 1/1000 of a mm (one part per 2267.whatever), so your layers may vary from, say, 0.3000 to 0.3005 mm (or 0.0500 to 0.0505 if you're Plexus). Walking past, breathing on the print platform, or the cogging that happens when the Z motors are regularly switched off by the firmware will have at least as big an effect.

The ribbing in the photos is way more than that. Run the carriage all the way up to the top, loosen and carefully retighten the Z couplers and see if that helps - it'll help realign the screw straight in the coupler. Somebody on reprap.org suggested putting a BB between the motor and screw; if you're adventurous and try that report back.

Kirk
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