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OSSM Actuator overview showing the assembled linear actuator

Printing

Follow these print settings for optimal strength and durability.
SettingValue
Walls6
Infill TypeCross Hatch or Gyroid
Infill Percentage15%
SupportsNone
Filament Estimate200g
Recommended FilamentPLA+
Print all parts in the default file orientation. Printing threaded components in other orientations causes structural weakness.
For the 24mm Clamping Thread, use 2 raft layers to promote better bed adhesion.
If you have issues printing the 24mm Clamping Thread, use the Non-standard 24mm Thread and Belt Clamp files instead (available in the source repository). These require additional hardware:
  • (Qty 2) M3x8
  • (Qty 1) M3x16
  • (Qty 3) M3 Hex Nut

Printed Parts List

QuantityPart Name
1Body - Bottom
1Body - Middle
1Body - Cover
1Belt Tensioner
124mm Clamping Thread - End Effector
124mm Clamping Thread - Belt Clamp
224mm Nut - 5 Sided
For additional documentation, see the 3030 Extrusion Stand guide.

Bill of Materials

GT2 Pulley

SpecificationValue
Bore8mm
Teeth20
Width10mm

GT2 Timing Belt

SpecificationValue
Width10mm
Length500mm

MGN12H Linear Rail + Bearing Block

SpecificationValue
Minimum Length250mm
Suggested Length350mm
Maximum Length550mm
Calculate your rail length using this formula: desired maximum stroke + 180mmYou must use an MGN12H rail. The “H” designates a longer bearing block than “C” for greater stability. The “12” indicates a 12mm rail width.

Ball Bearings

QuantitySpecification
6MR115-2RS 5x11x4mm

Fasteners

QuantitySpecification
8M3x8 Socket Cap Head Bolt
2M3x16 Socket Cap Head Bolt
1M3x20 Socket Cap Head Bolt
7M3 Hex Nut
3M5x20 Socket Cap Head Bolt
1M5 Hex Nut
4M5x35 Socket Cap Head Bolt
4M5 20mm Hex Coupling Nut (or M5 Hex Nut)

Assembly

Animated exploded view showing how actuator components fit together

Animated exploded view of actuator assembly

Exploded view of actuator from front angle

Exploded view - front angle

Exploded view of actuator from alternate angle

Exploded view - alternate angle

Belt Routing

Route the GT2 timing belt through the actuator body following these reference images:

Tensioner

Cross-section showing belt routing through the rear tensioner

Body

Cross-section showing belt routing through the middle body section

Belt Clamp

Cross-section showing belt routing through the front belt clamp