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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 filament with at least 4 perimeters and 40% infill. PLA works but may deform under sustained use due to heat buildup.

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Body components

Print one of each body component:

Body - Base

Body Base

Body - Middle

Body Middle

Body - Cover

Body Cover

Body - PCB Support Cover

PCB Support Cover
Alternative option: Print the Body - Middle Pivot instead of the standard middle piece if you want additional mounting flexibility.
Body Middle Pivot

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Belt clamps

Print one of each belt clamp:

Belt Clamp - Tensioner End

Belt Clamp Tensioner

Belt Clamp - Top

Belt Clamp Top

Belt Clamp - Bottom

Belt Clamp Bottom

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Toy mount components

Print one of each toy mount part:

Toy Mount - Rail to 24mm Thread

Toy Mount Rail

Toy Mount - 24mm Jam Nut

Toy Mount Jam Nut

Toy Mount - Vac-u-lock Adapter

Vac-u-lock Adapter

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Remote components

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

Remote Body (Ɨ1)

Remote Body

Remote Top Cover (Ɨ1)

Remote Top Cover

Remote Knobs (Ɨ2)

Remote Knobs

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Next steps

Once you have printed all parts, proceed to Step 2: Rear Tensioner Assembly.