16mm Sleeve Carriage for Rostock Printer and Igus Linear Bearings

by jpickens, published

16mm Sleeve Carriage for Rostock Printer and Igus Linear Bearings by jpickens Nov 30, 2012
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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.


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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my issue with using printed bearings is that when I apply any pressure on it with zip ties they no longer move freely and now I have jam!

These are not printed bearings, they are a special plastic material with integrated lubricants made by IGUS. My design was to modify the carriages to hold the IGUS bearings. I've got many hours on my bearings, and they are holding up well. I routinely put dry teflon lubricant on the rods just in case. Spray the stuff on and wipe off with a lint free cloth.

So.. how long do the igus bearings last?

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.

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:


Looks good and sounds good. Is the reamer really necessary? It costs just about as much as going for the bearings that are already in housings.

My Thing-o-Matic tends to print slightly undersized and makes circular shapes slightly oval in the horizontal axis when printed. If you have a really tuned printer, it might not be necessary, but you'd have to tweak your print to get slightly less than 16mm to allow the plastic to stretch a bit.

My goal in using the plastic bearings was to minimize weight. I knew that the platform would be heavy due to the non-bowden extruder. I figured that 6 plastic bearings would weigh about 100g less than 6 LM8UU metal bearings, keeping the total mass of the build system down.

Using the metal pre-packaged Igus bearings would partially negate the weight advantage. The noise and wear issues were also a consideration, but weight was the main one.

I already had the reamer set, which I use for fixing the link pins and center pins of VW buses which I own.

"expensive metal ones"?

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

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.


Where do you recommend getting Igus bearings?

You can get them directly from IGUS. They sell directly in most countries.

You can get them directly from IGUS. They sell directly in most countries.

You can get them directly from IGUS. They sell directly in most countries.

Odd the ones I get are cheaper than the ones in the video but they work fine and don't make a noise like that.