16mm Sleeve Carriage for Rostock Printer and Igus Linear Bearings by jpickens

3D Printing 3D Printer Parts

16mm Sleeve Carriage for Rostock Printer and Igus Linear Bearings

jpickens

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Published on November 30, 2012

Derived from

Vertical carriage for Rostock

by Johann

Carriage for Rostock Mini

by metzench

Description

Metzench designed an open 16mm saddle carriage for the Igus RJM-01-08 plastic linear bearing. The Igus bearings require a 16mm bushing to "squeeze" the ribbed bearing to 8mm tolerance. I modified the SCAD from Johann's original Rostock carriage to have a 16mm enclosed sleeve for holding the bearing.

I should add that I am currently building a Johann's Rostock with 8mm rods, and hope to use these simple and cheap bearings instead of the loud and expensive metal ones. We'll see how it goes.

Instructions

Print with 1 shell and at least 50% infill.
My ToM leaves a slightly undersized 16mm nominal sleeve.
Used an adjustable reamer from Harbor Freight to true up the sleeves.
Set the reamer to 15.8mm, and this gave a good squeeze on the Igus bearing to ride the 8mm rod. Maybe even too tight when I mocked it up. But better to start undersize and work up.

Please let me know what you think.

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misan on January 27, 2013 said:

Just an idea for the couplings: http://www.igus.es/wpck/defaul...

sousoux on January 7, 2013 said:

Have you started using this yet? If yes how are you finding it? I have some of the cheap Chinese bearings and they are already worn enough that they wobble diagonally. I was seriously looking at the Igus bearings. I was actually looking at boxing 4 on each tower to make the carriages more stable.

jpickens on January 7, 2013 said:

Doing dry runs just yesterday. Got the hot end wired up last night.

Right now I'm waiting for my heated bed and trying to figure out settings for the PG35L geared stepper I'm using.

Overall, I'd say the Igus bearings work very nicely, but I've only done about 20 minutes of dry prints with the entire 200g of Ultibots extruder/PG35L setup installed.

Running your Repetier firmware with Repetier Host. Thanks for your work on this.

video of a first movement with the printhead installed:

http://youtu.be/xjHBDExegqM

nophead on December 30, 2012 said:

"expensive metal ones"?

LM8UU are much cheaper than RJM-01-08 in my experience.

jpickens on December 30, 2012 said:

I guess I've been scared away from the cheap LM8UU's I've read about on the forums. The "good" ones go for a bit more than the $4.85 (US Dollars) I paid for the Igus bearings.