Fully 3D-printable bearing (parametric model)

Video:

Update 02/04/2021: A parametric version of this model has been added to the Fusion 360 source files.

These bearings are especially designed for 3D-printing. These bearings don't use regular balls like other bearings but it uses specially designed for 3D-printing roller elements. This insures the most supple 3D-printable bearings with the least amount of play.

The bearing prints in only one piece, fully assembled. You may have to wreck the balls a little lose after it has printed because the tolerances are very small. For the best result you can lubricate it with some grease. Hope you like it and can use it in your project. (results can depend on printer settings and type of 3D printer used).

I added a new 3D model of the small bearing to the file section called "homemade_printable_bearing_heavy_small_V3_easy_printable.stl" . With this model there is more space between the inner ring, the balls and the outer ring. This model should print more easy then the previous model but there will be more play between the inner and outer ring. This model is made for people who have trouble printing the first version. 

dimensions bearings (STL Files):
small bearing (V2 and V3): inner diameter = 12 mm
outer diameter = 40 mm
height = 12 mm

big bearing: inner diameter = 53 mm
outer diameter = 81 mm
height = 12 mm

Parametric model parameters (Fusion 360 source files):
d: Inner diameter
D: Outer diameter
th: Thickness
p: Play between balls and rings
RD: Roller element diameter
CH: Bearing edge chamfers
AM: Roller element amount (automatically calculated)
(See picture above left for an overview of the parameters)

The fusion 360 source file option includes these formats:
-.dwg
-.dxf
-.f3d
-.fbx
-.iges
-.obj
-.sat
-.skp
-.smt
-.step
-.stl
-.zip (containing .ipt and .iam files)