I feel like igus has been catching way too much flak lately - at

3D Printing
,
1

I feel like igus has been catching way too much flak lately - at their core, they are good bearings, you just have to use them properly.
http://www.youtube.com/watch?v=ZGBipbgwgME

2

But the price is still crazy. For around the same money I can use less force and run nice VXB linear bearings. I like the review though Tom!

3

This is hilarious, because I know you only just recently got all of this stuff; then so happens that we have a ‘flare up’ of people going “don’t use igus!”…lol

4

I really fought the slip-stick nature of igus and PBC linear bearings on my corexy. The problem is breaking the high static friction on direction changes of the carriage when velocity=0. Now granted in hindsight I should have designed several things differently on that printer. But the slip-stick issue, combined with how these style of bushings really dislike any misalignment made them a poor choice for a corexy. The micro stick would imbalance the belt tensions and introduce tiny racking forces and result in poor performance on circles.

5

@ThantiK I’ve noticed that too. I quite like them in our lulzbot mini.

6

it works very good for me since arround 2 years (w type), i use to print from 80 to 150mm/s with my delta.

7

For 3d printer construction applications, pressing the bushings into an interference fit housing to get the right clearance is nuts.

8

@Michel_DA_SILVA
The Ultimaker II does 300mm/s out of the box with conventional bearings. I’m not sure 150mm/s is a benchmark here.

9

@Marcus_Wolschon cool…

10

@Michel_DA_SILVA
I’m not going that fast myself with any of my UM2.
My jobs are rather slow and geared for perfect surface quality. Meaning 15 instead of the advertised 20 micron layer height and running for serveral days. That’s why I’m interested in bushings that are more quiet.

11

@Marcus_Wolschon - not really. It SAYS it does 300mm/s, and you can put 300mm/s in the settings, but that’s very different from actually printing at 300mm/s

The bed on the UM2 is 223mm x 223mm. I’d love to see a video of someone printing a cube on the UM (stock) that moves from min to max X and Y in 0.75 seconds

12

I apologise my aim was not to talk about speed but to confirm that I do good prints with Igus since 2 years, it works very good.

13

@Eclsnowman ​ Yeah, same for my corexy. I can only use them on my x axis. If I tried to use them on my Y axis, they just bind up.

14

I’d like to see the Igus bushing life recalculated for a dualstrusion XY gantry printer that has more carriage mass and puts significant reversing side-load on the bearings due to acceleration. A single-extruder i3 is relatively easy service conditions since almost all of the X and Y bearing loads are constant gravity force, not varying acceleration force with repeated shocks/spikes at corner jerks.

If you do some math on reasonable travel distances, most typical printers will exceed 100 km lifetime travel on X and Y and some will hit 1,000 km, and bearing life decreases with the load cubed, so it doesn’t take all that much added load or shock loading to get unacceptable life.

15

@Ryan_Carlyle you can run the calculations yourself at http://www.igus.eu/Apps/drylinexpert/default.aspx (i hope that’s the right link)

16

Unsubscribe

17

@Caleb_Roy thanks for the constructive feedback!

18

Hi
I just updated my prusa i3 with igus bushings.
all i can say is less noise and better printquality.
http://www.igus.de/wpck/2297/drylin_r_rjum_02
these are 1:1 to lm8uu an have an alucase so no problems in our printers.