3-Axis Robot Arm Exploded Assembly

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Bounding box: 2281.5 × 140.0 × 55.5 mm
Engine: Precision B-rep
Parameters: 88
Published: October 26, 2026

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The prompt

Create a simple, lightweight, 3D-printable 3-axis robot arm for Autodesk Inventor 2024. - Total height: approximately 500 mm. - Base: 140 × 140 × 12 mm. - Upper arm: 180 mm; forearm: 160 mm, measured between pivots. - Servos: 1 MG996R at the shoulder, 1 SG90 at the base and 1 SG90 at the elbow. - End tool: fixed 12V electromagnet, Ø20 × 15 mm, with rear M4 mounting. - Use simple parts, bolt pivots and spacers. Keep the arm lightweight. - Create separate parts and a complete assembly with exactly 3 rotational axes. - Make servo mounts adjustable and mark unverified dimensions. - Export individual STEP and STL files and a STEP assembly if supported. Generate one part at a time. Prioritize correct fit, easy assembly and low printing cost.

Parameters

Name	Value	Range
Layout gap	200 mm	100 – 400
Base width	140 mm	100 – 200
Base depth	140 mm	100 – 200
Base thickness	12 mm	6 – 30
Base mount hole diameter	4.5 mm	3 – 6
Base mount hole margin	10 mm	5 – 30
Central opening width	24 mm	10 – 40
Central opening depth	14 mm	6 – 30
Base servo mount length	45 mm	30 – 70
Base servo mount width	40 mm	25 – 60
Base servo mount height	25 mm	15 – 40
Base servo mount wall	4 mm	2 – 8
Base servo pocket length	23.5 mm	18 – 30
Base servo pocket width	12.5 mm	8 – 20
Base servo slot width	3.2 mm	2 – 6
Base servo slot length	12 mm	6 – 20
Turntable diameter	60 mm	40 – 80
Turntable height	30 mm	15 – 50
Turntable bore diameter	6 mm	3 – 10
Turntable bolt circle hole diameter	3.2 mm	2 – 6
Turntable bolt circle diameter	40 mm	25 – 60
Turntable cable clearance hole diameter	8 mm	4 – 12
Shoulder mount length	70 mm	50 – 100
Shoulder mount width	55 mm	40 – 80
Shoulder mount base thickness	5 mm	3 – 10
Shoulder side plate height	35 mm	20 – 50
Shoulder side plate thickness	5 mm	3 – 10
Shoulder servo pocket length	40.5 mm	30 – 55
Shoulder servo pocket width	20.5 mm	15 – 30
Shoulder side plate pivot hole diameter	4.5 mm	3 – 6
Shoulder mount slot width	4.5 mm	3 – 7
Shoulder mount slot length	15 mm	8 – 25
Upper arm length (pivot-to-pivot)	180 mm	120 – 240
Upper arm width	25 mm	15 – 40
Upper arm thickness	12 mm	5 – 20
Upper arm boss diameter	16 mm	10 – 25
Upper arm pivot hole diameter	4.5 mm	3 – 6
Upper arm lightening pocket length	60 mm	30 – 80
Upper arm lightening pocket width	8 mm	4 – 15
Elbow mount length	45 mm	30 – 60
Elbow mount width	35 mm	25 – 50
Elbow mount height	25 mm	15 – 35
Elbow mount wall thickness	4 mm	2 – 8
Elbow servo pocket length	23.5 mm	18 – 30
Elbow servo pocket width	12.5 mm	8 – 20
Elbow mount slot width	3.2 mm	2 – 6
Elbow mount slot length	10 mm	5 – 18
Elbow clevis gap	23 mm	15 – 30
Elbow clevis arm length	12 mm	6 – 20
Elbow clevis arm height	15 mm	8 – 25
Elbow clevis arm thickness	4 mm	2 – 8
Elbow clevis pivot hole diameter	4.5 mm	3 – 6
Forearm length (pivot-to-pivot)	160 mm	110 – 220
Forearm width	22 mm	15 – 35
Forearm thickness	10 mm	4 – 18
Forearm boss diameter	14 mm	10 – 20
Forearm pivot hole diameter	4.5 mm	3 – 6
Forearm rear M4 hole diameter	4.5 mm	3 – 6
Forearm lightening pocket length	45 mm	20 – 70
Forearm lightening pocket width	7 mm	3 – 12
End tool bracket length	30 mm	20 – 45
End tool bracket width	25 mm	18 – 40
End tool bracket height	18 mm	10 – 30
Magnet seat diameter	20 mm	12 – 28
Magnet seat depth	15 mm	8 – 20
Rear M4 mount hole diameter	4.5 mm	3 – 6
Cable exit slot width	4 mm	2 – 7
Electromagnet diameter	20 mm	12 – 28
Electromagnet length	15 mm	10 – 25
Rear M4 stud diameter	4 mm	3 – 5
Rear M4 stud length	6 mm	4 – 10
Lead wire diameter	1.6 mm	1 – 3
SG90 body length	23 mm	15 – 30
SG90 body width	12 mm	8 – 18
SG90 body height	29 mm	20 – 35
SG90 tab length	8 mm	5 – 12
SG90 tab height	2 mm	1 – 4
SG90 tab hole diameter	2.5 mm	2 – 3
SG90 output shaft diameter	5 mm	3 – 8
SG90 output shaft height	4 mm	2 – 8
MG996R body length	40 mm	30 – 55
MG996R body width	20 mm	15 – 30
MG996R body height	36 mm	25 – 50
MG996R tab length	10 mm	6 – 14
MG996R tab height	2.5 mm	1 – 5
MG996R tab hole diameter	3 mm	2 – 4
MG996R output shaft diameter	6 mm	4 – 8
MG996R output shaft height	5 mm	3 – 8

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.

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