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So you’ve decided to build an OSSM. This is a rewarding project, suitable for beginner and intermediate makers. There’s clear documentation here to get the hardware in your hands — let’s get started.

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Step 1: Source Your Parts

The OSSM is a combination of a servo motor, metric hardware, 3D-printed parts, and a custom PCB. Before you print anything, you’ll need to purchase the non-printable components. The easiest route: order a kit directly from Research and Desire — it includes the motor, hardware, PCB, and linear rail matched to the current build. Sourcing yourself: the community Discord is full of makers who’ve sourced parts from AliExpress, Amazon, and local hardware stores. Check the full bill of materials to see exactly what you need.

Bill of Materials

Complete hardware list for the standard OSSM build.

Motor Specs

The 57AIM30 “Gold Motor” and compatible alternatives.

PCB Files

Schematics and board design for the OSSM controller.

CAD Files

Source design files for modifying or extending hardware.

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Step 2: Print Your Parts

Printed parts can also be purchased from Research and Desire, but if you’ve got a printer, go ahead and get started. Each section below has print settings, STL files, and quantities.

Actuator

The core linear motion assembly.

Stand

3030 extrusion stand with pivot arm.

PitClamp Mini

Quick-release motor mount.

Remote

Wired remote control enclosure.

Toy Mounting

Adapters for attaching toys to the actuator.

PCB Enclosure

Protective housing for the OSSM control board.
All OSSM print files are also available on MakerWorld.

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Step 3: Assemble

With parts sourced and printed, follow the build guide to put it all together. Wire the motor, flash the firmware, and you’re ready to go.

Build Guide

Step-by-step assembly instructions.

Wire Your Motor

Connect the Gold Motor (57AIM30) correctly.

Flash Firmware

Install the latest firmware via the web flasher.

Motor Programming

Configure third-party motors before first use.

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Community

Need help or want to share your build? The Kinky Makers Discord is the best place to ask questions, find sourcing tips, and show off your work.

Kinky Makers

DIY builds, open-source development, and maker community discussions.
Join

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Community Modifications

The community has developed several popular modifications that extend OSSM functionality.
Community mods are not officially supported. Review the safety guidelines before installing any modifications.

PitClamp Reinforced

Strengthened mounting system with improved durability.

SaladDressing's Mods

Belt clamps, capstan drive, quick-change mounts, and bracket accessories.