TAZ 6 IGUS bearing failure / wearing out

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martinbogo
Posts: 26
Joined: Sun Jun 21, 2015 12:03 pm

TAZ 6 IGUS bearing failure / wearing out

Post by martinbogo » Wed Oct 11, 2017 7:30 pm

I make a lot of use of my TAZ 6 printer for a multitude of projects at my Makerspace, and at home.

( I use it at least as much, if not more than, James from X-Robots uses his... and that's saying something )

After ~5000 hours of printing time, I was getting lots of wobble artifacts. I could gently twist, and even lift, the build plate. The corners would move almost 3 millimeters up, and 1-2 millimeters to the right and left.

After checking everything from Z-axis alignment, frame alignment and squaring, and belt tightness... it occurred to me to check the IGUS bushings. I never lubricate my axis, since IGUS bushings are self-lubricating and can actually be damaged by the application of oils or solvents. I did regularly wipe down the rods with a clean microfiber cloth, to keep them clean and free of dust and skin oils.

I was >shocked< to find out how much the IGUS bushings had worn down. The center channel was oval-ish, rather than round, on all four bushings. Compared to a new bushing, there was a 0.5-0.7 mm of wear along the vertical axis, and 0.2-0.4 mm of wear along the horizontal axis.

New bushings are available in the Lulzbot store for $14 : https://www.lulzbot.com/store/parts/10m ... ushing-4pk

The IGUS bushings for the X axis also have worn, but not as badly. Again, they have worn much more in the vertical, than the horizontal ( 0.08-0.15 mm in the vertical, 0.02-0.07 in the horizontal ). I have not replaced them yet.

Put simply -- after about 2000 hours, you should >definitely< replace your IGUS bushings along the Y axis to make sure you maintain the best possible quality prints. This is the trade-off between using linear bearings, and the IGUS plastic bushings. They wear down, even though they are self-lubricating. Even if you keep your steel rods very clean.
IMG_20171011_202647.jpg
After replacing the bushings with new ones, and checking that the y-axis belt was correctly tensioned, the build plate was easy to maintain level AND my prints have the straight sidewalls and crisp details I expect from the TAZ 6.

nuroo
Posts: 150
Joined: Mon Apr 10, 2017 2:08 pm

Re: TAZ 6 IGUS bearing failure / wearing out

Post by nuroo » Wed Dec 26, 2018 3:12 pm

Was it easy to replace the bearings for the bed? Having trouble finding a guide.


kmanley57
Posts: 1111
Joined: Sun Feb 01, 2015 3:53 pm

Re: TAZ 6 IGUS bearing failure / wearing out

Post by kmanley57 » Thu Dec 27, 2018 7:26 am

It is pretty easy to change the bearings on the bed. I can do it with the bed/carriage still on the machine though. :lol:

LOTS of practice!
I will express my CRAZY ideas at any time! So you have been warned. None of my opinions are Lulzbots and can be wrong at any second.

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