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Before you begin assembly, you need to print all required parts. This page lists every component you need to print for a complete OSSM build.
This guide covers the official OSSM build. You can find community modifications in the OSSM Mods section to customize your build.
For best results, use PETG or ABS with 0.2–0.28 mm layer height, 4–5 perimeters, and 40–60% infill. PLA can work, but it may deform under sustained heat and load. Use 0.4–0.6 mm nozzles, enable supports only where needed, and orient parts so layer lines run across the direction of expected stress (especially for clamps and the middle body).

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Body components

Print one of each body component:

Body – Base (×1)

OSSM body base piece

Body – Middle (×1)

OSSM body middle piece

Body – Cover (×1)

OSSM body top cover

PCB Mount – Lid (×1)

OSSM PCB enclosure lid
Alternative center section: print Body – Middle Pivot (×1) instead of the standard middle if you want mounting flexibility (recommended when using the extrusion stand).
OSSM body middle pivot piece
If you’re printing the PCB enclosure, you need both pieces: PCB Mount – Box (×1) and PCB Mount – Lid (×1) . The lid is pictured above; the box prints without supports on its base.

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Belt clamps

Print one of each belt clamp:

Belt Clamp – Tensioner End (×1)

Belt clamp for the tensioner end

Belt Clamp – Top (×1)

Top half of the belt clamp

Belt Clamp – Bottom (×1)

Bottom half of the belt clamp

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Toy mount components

Print one of each toy mount part:

Toy Mount – Rail to 24 mm Thread (×1)

Adapter from rail to 24 mm threaded mount

Toy Mount – 24 mm Jam Nut (×1)

24 mm jam nut for threaded toy mount

Toy Mount – Vac-u-lock Adapter (×1)

Vac-u-lock adapter
Additional mounting options you can print:
  • Flange Base (×1) for suction-cup toys with flanges
  • Flange Rings 2” and 2.5” (×1 each) to secure different flange sizes
  • Double Double Adapter (×1) for extended Vac‑u‑lock compatibility

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Remote components

Print one remote body, one top cover, and two knobs:

Remote Body (×1)

Remote body enclosure

Remote Top Cover (×1)

Remote top cover

Remote Knobs (×2)

Two rotary encoder knobs for the remote

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Parts checklist

Use this list to verify you’ve printed everything needed for the official build:
  • Body – Base (×1)
  • Body – Middle (×1)
  • Body – Cover (×1)
  • PCB Mount – Box (×1) and Lid (×1)
  • Belt Clamp – Tensioner End (×1)
  • Belt Clamp – Top (×1)
  • Belt Clamp – Bottom (×1)
  • PitClamp v1.1 – 57AIM Ring (x1), Lower Standard (x1), Upper + Handle (x1), Hex Dogbone (x1), Round Dogbone (x1)
  • Toy Mount – Rail to 24 mm Thread (×1)
  • Toy Mount – 24 mm Jam Nut (×1)
  • Toy Mount – Vac‑u‑lock Adapter (×1)
  • Optional: Flange Base (×1)
  • Optional: Flange Rings 2” (×1) and 2.5” (×1)
  • Optional: Double Double Adapter (×1)
  • Remote Body (×1)
  • Remote Top Cover (×1)
  • Remote Knobs (×2)
You’re ready to build once every item above is printed and cleaned up. Do a quick dry-fit of the PCB in its mount and test that the jam nut threads smoothly onto the 24 mm adapter.
No printer? You can purchase a complete printed parts kit here: 3D Printed Parts Kit for OSSM.

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Next steps

When your prints are finished, continue to assembly in Step 2: Rear Tensioner Assembly .