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Bearings Library - Airsoft BBs

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ᴜ ɴ ʀ ᴇ ᴀ ʟ

@Unreal

All the bearings you'll ever need for your simple project are here. And they are super cheap. They use 6mm Airsoft BBs.

Rating: 4.769 / 5
Likes: 530
Downloads: 1,947
Makes: 29
Views: 12,092
Reviews: 26

Updated at source: Jan 30, 2026

Model information

Source: Printables
Category: Mechanical Parts
License: Creative Commons — Attribution

Details Files (218)Makes & comments (Makes: 29) (Comments: 49)Remixes (2)Collections (617)

All the bearings use the standard 6mm Airsoft BBs.

Ranging from 20mm, up to 200 mm (outer diameter), in 2 and 5 millimeter steps, and are 7.1mm thick.

I don't even know what you could do with a 200mm bearing, but if you do, send us a picture about your Amazing project!

Every geometry have been optimized in order to minimize the gap between the spheres.

If you are not comfortable with the internal diameter of the bearing, the .STP file is also available for you to adjust it to your needs.

Printing Tips

It should be ok to print at 0.2mm layer height, but if you are struggling to get the exact fit just go with 0.1mm and slow down your print.
Also, if you print just one bearing at a time, be sure to set a minimum layer time, so the printer will wait some time between layers. Otherwise your print will deform, and the bearing won't work properly.
As always, make sure your filament is properly dry.
Set random z-seam for better results.

Materials

The idea is to use a material which's hardness is comparable to your BBs one, in order to have a long lasting bearing. As a rule of thumb, the harder, the better.

I recommend using PLA because of it's hardness and cheapness.

Table of Bearings

External Diameter [mm]	Internal Diameter [mm]	N. Spheres
20	4	6
22	6	7
24	8	8
25	8	8
26	10	9
28	12	10
30	14	11
32	14	12
34	16	13
35	18	14
36	18	14
38	20	15
40	22	16
42	24	17
44	26	18
45	28	19
46	28	19
48	30	20
50	32	21
52	34	22
54	36	23
55	38	24
56	38	24
58	40	25
60	42	26
62	44	27
64	46	28
65	48	29
66	50	30
68	52	31
70	54	32
72	56	33
74	58	34
75	58	34
76	60	35
78	62	36
80	64	37
82	66	38
84	68	39
85	68	39
86	70	40
88	72	41
90	74	42
92	76	43
94	78	44
95	78	44
96	80	45
98	80	46
100	82	47
102	84	48
104	85	49
105	88	50
106	88	50
108	90	51
110	92	52
112	94	53
114	96	54
115	198	55
116	198	55
118	100	56
120	102	57
122	104	58
124	106	59
125	108	60
126	108	60
128	110	61
130	112	62
132	116	64
134	118	65
135	118	65
136	120	66
138	122	67
140	124	68
142	126	69
144	128	70
145	128	70
146	130	71
148	132	72
150	134	73
152	136	74
154	138	75
155	138	75
156	140	76
158	142	77
160	144	78
162	146	79
164	146	80
165	148	81
166	148	81
166	148	81
168	150	82
170	152	83
172	154	84
174	156	85
175	158	86
176	158	86
178	160	87
180	162	88
182	164	89
184	166	90
185	168	91
186	168	91
188	170	92
190	172	93
192	174	94
194	176	95
195	178	96
196	178	96
198	182	98
200	184	99

Let's stop glue on 3D prints, together.

External Diameter [mm]	Internal Diameter [mm]	N. Spheres
20	4	6
22	6	7
24	8	8
25	8	8
26	10	9
28	12	10
30	14	11
32	14	12
34	16	13
35	18	14
36	18	14
38	20	15
40	22	16
42	24	17
44	26	18
45	28	19
46	28	19
48	30	20
50	32	21
52	34	22
54	36	23
55	38	24
56	38	24
58	40	25
60	42	26
62	44	27
64	46	28
65	48	29
66	50	30
68	52	31
70	54	32
72	56	33
74	58	34
75	58	34
76	60	35
78	62	36
80	64	37
82	66	38
84	68	39
85	68	39
86	70	40
88	72	41
90	74	42
92	76	43
94	78	44
95	78	44
96	80	45
98	80	46
100	82	47
102	84	48
104	85	49
105	88	50
106	88	50
108	90	51
110	92	52
112	94	53
114	96	54
115	198	55
116	198	55
118	100	56
120	102	57
122	104	58
124	106	59
125	108	60
126	108	60
128	110	61
130	112	62
132	116	64
134	118	65
135	118	65
136	120	66
138	122	67
140	124	68
142	126	69
144	128	70
145	128	70
146	130	71
148	132	72
150	134	73
152	136	74
154	138	75
155	138	75
156	140	76
158	142	77
160	144	78
162	146	79
164	146	80
165	148	81
166	148	81
166	148	81
168	150	82
170	152	83
172	154	84
174	156	85
175	158	86
176	158	86
178	160	87
180	162	88
182	164	89
184	166	90
185	168	91
186	168	91
188	170	92
190	172	93
192	174	94
194	176	95
195	178	96
196	178	96
198	182	98
200	184	99

External Diameter [mm]	Internal Diameter [mm]	N. Spheres
20	4	6
22	6	7
24	8	8
25	8	8
26	10	9
28	12	10
30	14	11
32	14	12
34	16	13
35	18	14
36	18	14
38	20	15
40	22	16
42	24	17
44	26	18
45	28	19
46	28	19
48	30	20
50	32	21
52	34	22
54	36	23
55	38	24
56	38	24
58	40	25
60	42	26
62	44	27
64	46	28
65	48	29
66	50	30
68	52	31
70	54	32
72	56	33
74	58	34
75	58	34
76	60	35
78	62	36
80	64	37
82	66	38
84	68	39
85	68	39
86	70	40
88	72	41
90	74	42
92	76	43
94	78	44
95	78	44
96	80	45
98	80	46
100	82	47
102	84	48
104	85	49
105	88	50
106	88	50
108	90	51
110	92	52
112	94	53
114	96	54
115	198	55
116	198	55
118	100	56
120	102	57
122	104	58
124	106	59
125	108	60
126	108	60
128	110	61
130	112	62
132	116	64
134	118	65
135	118	65
136	120	66
138	122	67
140	124	68
142	126	69
144	128	70
145	128	70
146	130	71
148	132	72
150	134	73
152	136	74
154	138	75
155	138	75
156	140	76
158	142	77
160	144	78
162	146	79
164	146	80
165	148	81
166	148	81
166	148	81
168	150	82
170	152	83
172	154	84
174	156	85
175	158	86
176	158	86
178	160	87
180	162	88
182	164	89
184	166	90
185	168	91
186	168	91
188	170	92
190	172	93
192	174	94
194	176	95
195	178	96
196	178	96
198	182	98
200	184	99

Bearings Library - Airsoft BBs

Model information

Printing Tips

Materials

Table of Bearings

Tags

External Diameter [mm]	Internal Diameter [mm]	N. Spheres
20	4	6
22	6	7
24	8	8
25	8	8
26	10	9
28	12	10
30	14	11
32	14	12
34	16	13
35	18	14
36	18	14
38	20	15
40	22	16
42	24	17
44	26	18
45	28	19
46	28	19
48	30	20
50	32	21
52	34	22
54	36	23
55	38	24
56	38	24
58	40	25
60	42	26
62	44	27
64	46	28
65	48	29
66	50	30
68	52	31
70	54	32
72	56	33
74	58	34
75	58	34
76	60	35
78	62	36
80	64	37
82	66	38
84	68	39
85	68	39
86	70	40
88	72	41
90	74	42
92	76	43
94	78	44
95	78	44
96	80	45
98	80	46
100	82	47
102	84	48
104	85	49
105	88	50
106	88	50
108	90	51
110	92	52
112	94	53
114	96	54
115	198	55
116	198	55
118	100	56
120	102	57
122	104	58
124	106	59
125	108	60
126	108	60
128	110	61
130	112	62
132	116	64
134	118	65
135	118	65
136	120	66
138	122	67
140	124	68
142	126	69
144	128	70
145	128	70
146	130	71
148	132	72
150	134	73
152	136	74
154	138	75
155	138	75
156	140	76
158	142	77
160	144	78
162	146	79
164	146	80
165	148	81
166	148	81
166	148	81
168	150	82
170	152	83
172	154	84
174	156	85
175	158	86
176	158	86
178	160	87
180	162	88
182	164	89
184	166	90
185	168	91
186	168	91
188	170	92
190	172	93
192	174	94
194	176	95
195	178	96
196	178	96
198	182	98
200	184	99