by schlem, published

"IMPROVED" BALL BEARINGS by schlem Jan 14, 2013
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Friends, Don't Print This. It's Crap - It will only serve to disappoint and anger you. Really, it doesn't work.
-schlem May, 2014

This thing was made with Tinkercad. Improved Ball Bearings with 9 ball bearings

24mm OD / 6mm ID as designed. Should scale fine up or down. I think.
Based on the first 8-ball Ball Bearings cartridge I designed, I packed another bearing in the races to better support the structure. Who knows how this gizmacchi will print, but the design has bearings precisely dimensioned (5mm) to fit the races. I don't know yet how round these balls will print, but they will likely need to be broken from races before they will rotate. This is not a precision bearing, this is proof of concept, but a high precision 3D printer might actually produce a usable low-speed, low-load bearing.

+++ I have further improved this design by using a shape script for the spherical bearings, that creates smaller facets and then laboriously and precisely positioning the bearings in the race, so that there is absolutely minimal contact between bearings and races. +++

When you print it out, let me know how it came out - Thanks, schlem


I had a couple of these printed up by Shapeways, and as a bearing, they are terrible. The precision of the printing process used is such that the bearings are fused to the inner and outer races. If you could break them free (and I haven't), they would be a lumpy, dumpy bearing that would soon self-destruct. I think a better plan of action is to print the inner and outer races, adjusting for the precision of your printer, and use off the shelf round things for bearings (BBs, pellets, airsoft, etc). Keep me posted, Thingmakers.

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Then why do you still have this posted?

There are a lot of unprintable designs on Thingiverse - for many reasons.
Archive, inspiration, education, a cautionary tale for other designers. Those are MY reasons.

OK, all you fidget spinner fanboyz:

This bearing that I designed FOUR YEARS AGO was junk then, and it's junk now. Just buy real bearings.
Here's a guy on eBay selling TEN for $2.70 - WITH FREE SHIPPING.
That's $0.27 each. Even if you only have a paper route income, you can afford that.
And it will be so much vastly greatly superior to trying to print THIS ABOMINATION.

it works for me but i just need the size

You could do what I did: Open the STL in an editor and measure it.
24 mm OD
5 MM height


what app do you use to make these prints because i am trying to find one but can`t

is this size a 608 ball bearing

Nope. it's just a random size. Feel free to scale as you would.
I think you're also asking what I used to generate these renders??
Tinkercad. Learn it; Love it.

But seriously, can you not read? This is a shit bearing. You're way better off buying real ones, even super cheapo ones.

Does this work for an actual fidget spinner?

See the Makes. NO.
This is junk when printed FDM. I am sorry I ever created it. Do NOT count of this working in any fashion. I should delete it.

i may print 1

keep it, it is cool