Parametric Lazy Susan Bearing
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A simple 3d printed lazy Susan bearing with a parametric F360 file to adjust the diameter and number of bearings.
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This is a simple Lazy Susan bearing design I made for a future project. It currently is 5" in diameter, but I intend on making it much larger, so this is really a proof of concept. You can buy Lazy Susan bearings in the 20" range, but they are expensive and I don't need precision.
I made this model parametric so you can download the F360 file and alter the diameter, the bearing size, the bearing gap tolerance as well as the number of bearings in the alternate version.
On that topic, this design comes with two different inner rings. One is a track much like the outer ring, but it takes many more bearing balls to fill. The bearing balls aren't “expensive” (especially compared to the giant lazy Susan bearings) but they aren't cheap enough for me to fill multiple 20" rings with 160 balls each. So, to get around that, I designed a second version that has numerous spherical slots for balls to fit into.
The second version of the inner ring doesn't spin as freely as the version filled with bearing balls, but it spins fairly well and I found that it actually has a little less play to it overall. Neither of these are as smooth as an all metal Lazy Susan Bearing, but they are smooth enough for my needs and waaaaay cheaper.
The inner rings are designed in such a way that they can be flipped so the mounting tabs are on either the top or bottom.
The mounting holes are 6mm and intended for M5 bolts/screws and the “access port” to install the bearing balls uses M4 bolts and nuts to be attached.
I have plans to break up a larger diameter bearing (20" or so) into sections that fit on a standard printer and can be bolted together, but haven't had the time yet.
Both are included in this design, so it's up to you which one you use.
Here are the bearing balls I used (3/8" steel bearing balls): https://amzn.to/477b8R6
You can calculate how many balls you need for the full track version with this equation:
Bearing Balls needed = (Diameter * Pi) / ball diameter
Printing:
In my experience, both the inner and outer rings printed just fine without supports, provided you orient the tabs to be on the print bed. I printed the “access port” door in it's slot in the outer ring to ensure they had a snug fit, but it should work either way.
Overture Orange PLA with 15% infill and 4 perimeter walls.