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General

OSSM is a compact, customizable sex machine based around the NEMA23 motor mount pattern. You can drive it with stepper motors or, for best results, servo motors. The design combines 3D printed parts with off-the-shelf components, giving you full control over your build.
OSSM offers several advantages over commercial alternatives:
  • Full control: Adjust stroke speed and depth precisely
  • Open platform: You’re not locked into a specific company’s ecosystem
  • Customizable: Create patterns, write your own control software, or modify the hardware
  • Adaptable: Swap attachments, use different toy mounts, or upgrade to a larger motor
  • Cost-effective: More features than equivalently priced commercial machines
Check the Bill of Materials for the complete parts list. The BOM is regularly maintained and includes links to suppliers.
Standard recommended build specs:
  • 32 lbs (14 kg) of force at 20V DC
  • Up to 50 lbs (22 kg) of force at 36V DC
  • 8” (20 cm) stroke with a 350mm rail
Many users successfully use large knotted toys anally without issue.
The 2.5 lb (1.1 kg) maximum toy weight is a conservative recommendation for reliable long-term performance, not a hard failure threshold. Several factors contribute to this limit:
  • Inertia during direction changes: Heavier toys create more stress on the belt, printed parts, and mounting hardware during rapid acceleration and deceleration at stroke endpoints
  • Belt wear and slippage: Additional weight increases the load on the timing belt, especially at higher speeds
  • Printed part durability: Standard PLA or PETG parts may experience faster wear or creep under sustained heavy loads
  • Cantilever stress: The toy extends from the end-effector, creating a lever arm that amplifies forces on the rail carriage and bearings
If you want to exceed the recommendation:
  • Print load-bearing parts in stronger materials (PETG, ABS, polycarbonate, or nylon)
  • Use the pitclamp system for improved rigidity
  • Request a wider 15mm belt for better power transfer
  • Reduce maximum speed to lower inertial forces during direction changes
  • Ensure proper belt tension and rail alignment
The motor itself can handle significantly more—the spec reflects safe operating margins for the full mechanical system under typical use. Community members have experimented with heavier setups; join the Kinky Makers Discord to discuss modifications and real-world results.
Yes. OSSM uses a nearly silent belt drive system. When paired with a servo motor (recommended), the machine operates very quietly.
Yes—OSSM is certified open-source hardware under the CERN Open Hardware Licence Version 2 - Strongly Reciprocal. OSHWA Certification BadgeAll contributions to the GitHub repository are assumed to use the same license.
The main differences between the DIY Kit and Ready-to-Play are the mounting system and assembly state:
FeatureDIY KitReady-to-Play
AssemblyRequires assembly using the build guideFully assembled, ready to use
Mounting systemMiddle pivot body (angle adjustment at the actuator)PitClamp Mini (quick-release with integrated pivot for easier mobility)
StandNot included—source your own or build a custom mountIncludes collapsible stand with sandbag counterweight
RemoteWired remote includedWired or wireless remote (depending on configuration)
Power supplyUSB-C PD adapter included24V barrel jack supply included
The PitClamp Mini mounting system on Ready-to-Play units provides easier repositioning and angle adjustment during use. The DIY Kit’s middle pivot body offers the same core functionality but requires more effort to reposition.Both configurations support the same stroke patterns, speeds, and accessories. For most users, the choice comes down to whether you want a hands-on build experience or a ready-to-use solution.
Want the PitClamp Mini with your DIY Kit? You can purchase the PitClamp Mini kit separately alongside the DIY Kit. The PitClamp kit includes its own non-pivot actuator middle body, which replaces the middle pivot body from the DIY Kit. You’ll end up with a few extra parts, but everything is fully compatible.
Streaming mode is an experimental feature that allows external applications to control your OSSM in real-time via Bluetooth. Unlike Simple Penetration and Stroke Engine which generate motion patterns internally, Streaming mode receives position commands from an external source.Common uses:
  • Playing funscript files synchronized with video content
  • Integration with third-party control applications
  • Developer testing and custom automation
Streaming mode is experimental and not recommended for general play. Only use streaming with trusted applications from known sources. Always test at low intensity first and keep physical stop controls accessible.
Getting started:
  1. Update to firmware version 3.0 or later
  2. Select Streaming from the main menu
  3. Use the Funscript Player or a compatible BLE application
For technical details, see the Operating Modes and BLE Protocol documentation.

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Motors

While you can theoretically use any NEMA23 mount motor, some work better than others. The community recommends closed-loop servo motors over stepper motors because they are:
  • More efficient
  • Quieter during operation
  • Easier to program
  • More responsive across the full speed range
Do not purchase the 60AIM motor. Despite the similar naming, the 60AIM uses a larger NEMA24 (60 mm) frame that does not fit the standard OSSM printed parts. Stick with NEMA23 (57 mm) frame motors like the 57AIM30 Gold Motor.
Stepper motors are cheaper but significantly noisier. For the best experience, invest in a servo motor.
Your motor choice depends on several factors:
  • Vaginal or anal use
  • Size of toys
  • Desired speed
Motor recommendations:
MotorUse CaseForce
57AIM30 (Gold Motor)General purpose, recommended for new builds~20 lbs
100W iHSV57 ServoVaginal with medium toys, anal with smaller toys10 lbs
140W iHSV57 ServoVaginal with larger toys, anal with medium toys15 lbs
180W iHSV57 ServoWide range of toys, vaginal or anal20 lbs
Servo motors deliver consistent torque across the entire speed range. Stepper motors produce maximum force at lower speeds and have a lower top speed than servos.
For extremely large toys, consider the Squooter build (see the Kinky Makers Discord) which uses the larger NEMA34 motor mount.
The muscles in the anal region are powerful. Users commonly bear down or clench during stimulation, which creates significant resistance. Larger toys combined with strong muscles require more motor power to maintain consistent motion.

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3D Printing

All OSSM STL files are available on the Kinky Makers GitHub repository. This includes:
  • Core actuator components
  • Toy mounting options (Vac-U-Lock adapter, flange base, double-double)
  • Stand parts
  • Remote enclosure
  • PitClamp Mini (if you want to upgrade from the standard middle pivot body)
Each part in the Hardware documentation also includes direct download links to the STL and STEP files.
If your DIY Kit came with a middle pivot body and you want the PitClamp Mini mounting system instead, you can print the PitClamp parts yourself using the files from GitHub. You’ll also need the fasteners listed in the PitClamp Mini Bill of Materials—these are not included in the DIY Kit. Contact support@researchanddesire.com to purchase a hardware-only kit, or source the components yourself.
Minimum requirements:
  • Bed size: 105mm × 105mm
  • Print height: ~125mm (for the Vac-U-Lock compatible adapter)
The plate mount is significantly shorter if height is a constraint.
Structural parts: Use strong materials such as:
  • PLA
  • PETG
  • ABS
  • ASA
  • PCTG
Non-structural parts: Print in whatever material you prefer.
Additives used in matte filaments may weaken the material. Check the material properties before using specialty filaments.
If you experiment with unusual materials, share your results in the Kinky Makers Discord!
30% infill works well for PLA on non-flexible parts.
Use at least 3mm walls for non-flexible parts.
Some mounting solutions use clamps that require flexibility. For these parts:
  • Wall thickness: 2mm
  • Lower infill percentage
  • Gyroid infill pattern

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Mounting and Toys

After choosing your motor, selecting a toy mount is your next decision. Options include:
  • Vac-U-Lock compatible mount: Works with the popular Vac-U-Lock system
  • Double-double mount: Alternative mounting system
  • OSSM Platten: Plate mount for suction cup toys with tie-down points
Research & Desire does not currently sell a KlicLok adapter. OSSM uses a Vac-U-Lock compatible mounting system as its standard toy interface.If you have toys with KlicLok fittings, you have a few options:
  • Community designs: Some community members have designed KlicLok adapters—check the Kinky Makers Discord for community-contributed designs and discussions
  • Third-party adapters: KlicLok-to-Vac-U-Lock adapters are available from various retailers, allowing you to use KlicLok toys with the standard OSSM mount
  • Alternative mounting: Use the harness-style clamp or tie-on mounting methods, which can secure toys regardless of their base type
The M24×3 threaded end effector is an open standard—if you have 3D printing capabilities, you can design custom adapters for any mounting system.
Several mounting options are available:
  • Standard pipe mounts (US/Canadian sizing)
  • 80/20 aluminum extrusion rails (modular construction system)
  • Manfrotto boom compatible adapters
Your mounting solution is limited only by your imagination and use case.
Yes, the OSSM actuator and PitClamp Mini mounting base are compatible with any slotted aluminum extrusion, including both 3030 and 4040. The T-nuts included with R+D kits fit both 3030 and 4040 extrusion slots.Key considerations for 4040:
Component30304040
Actuator / PitClamp Mini baseFull compatibilityFull compatibility
T-nutsStandard fitStandard fit (same T-nuts work)
Pivot platesDesigned for 3030Usable, but tolerances are closer
Printed feet and capsPress-fit designed for 3030May not fit—print custom or leave open
Pivot plate notes:The standard pivot plates are designed for 3030 extrusion but will work on 4040. However, some intentionally toleranced connections—where bolts seat fully against the internal extrusion structure when tightened—will not engage the same way on 4040. The T-nuts will still provide good rigidity, but expect slightly closer tolerances.
Each additional pivot point you add to a stand introduces some play. Building a rigid stand that can handle the OSSM’s forces is often the harder part of the build.
Community alternatives:The Kinky Makers Discord has several community-designed 4040 stand variations. A popular option is the “Shick’s Mount,” which is specifically designed for 4040 extrusion.
If you’re sourcing your own extrusion and want maximum compatibility with the standard printed parts, 3030 is the easier choice. If you prefer 4040 for added rigidity, expect to adapt or reprint some stand components.

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Control and Software

Control options depend on your use case:
  • Wired remote: Included with DIY kits and some Ready-to-Play configurations
  • RADR (Research and Desire Remote): Official wireless remote with Bluetooth connectivity
  • xToys app: Control OSSM via Bluetooth using the xToys phone or desktop app—no physical remote required (see xToys Integration)
  • Custom solutions: Build your own controller—that’s the advantage of open-source hardware
Is a physical remote required? Yes. You need a physical remote to control the OSSM safely. This can either be the wired remote or the RADR wireless remote. If you prefer app-based control, you can skip the wired or wireless remote and use xToys in addition to your physical remote. xToys connects directly to your OSSM via Bluetooth and provides full control including custom patterns, multi-toy coordination, and scripted interactions. However, this is not tested or maintained by Research & Desire.
No. Each electronics package option includes only one remote type. If you select the Wireless - Fully Assembled option, you receive the RADR wireless remote only—the wired remote board is not included.If you want both remotes, purchase the wired remote board separately. You can only use one remote at a time, but having both gives you a backup or lets you switch between wired and wireless control depending on your preference.

Wired Remote board

Purchase the wired remote board separately
The DIY Kit always requires assembly of the OSSM actuator—you’ll receive components that need to be assembled using the Build Guide.When you see “Fully Assembled” in the DIY Kit options, this refers only to the remote, not the main machine:
OptionWhat’s preassembledWhat you assemble
Wired Remote - UnassembledNothingOSSM actuator + remote enclosure
Wired Remote - Fully AssembledWired remote onlyOSSM actuator
Wireless Remote - Fully AssembledWireless remote (RADR) onlyOSSM actuator
If you want a fully assembled OSSM that’s ready to use out of the box with no assembly required, you need the Ready-to-Play edition instead of the DIY Kit.
Quick summary: DIY Kit = you build the machine. Ready-to-Play = we build it for you. The remote assembly options within the DIY Kit only affect whether your remote arrives assembled.
Yes. If you have an existing OSSM with the wired remote, you can add wireless control without replacing any hardware on the OSSM itself.What you need:
  1. Purchase a RADR — The RADR Wireless Remote is available from Research & Desire
  2. Update your OSSM firmware — Flash firmware version 2.0.0 or newer using the Web Flasher
That’s it. No mainboard replacement, no soldering, no physical modifications. The same OSSM PCB that works with the wired remote also supports Bluetooth connectivity with the RADR after the firmware update.

RADR Quick Start

Follow the setup guide to pair your RADR with your OSSM.
Both remotes provide full control over your OSSM, including access to all stroke patterns. The main differences are in connectivity and ease of pattern switching:
FeatureWired RemoteRADR (Wireless)
ConnectionEthernet cable to OSSM boardBluetooth (wireless)
Stroke patternsAll 7 patterns available via Stroke EngineAll 7 patterns available via Pattern Mode
Pattern switchingDouble-press the right encoder to open pattern menuSingle press of the dedicated Pattern button
Multi-device supportOSSM onlyOSSM + other Bluetooth devices (Lovense, etc.)
PowerPowered via cableBuilt-in rechargeable battery (USB-C charging)
The RADR connects via Bluetooth only—there is no option to connect it via an Ethernet or USB cable. If you need a wired connection, use the standard wired remote.
Both remotes support the same motion patterns: Simple Stroke, Teasing or Pounding, Robo Stroke, Half’n’Half, Deeper, Stop’n’Go, and Insist. Pattern switching is slightly more convenient on the RADR due to its dedicated button, but the wired remote provides identical functionality.
Only one remote can be connected at a time. You cannot use both the wired remote and RADR simultaneously. If you want a backup remote, you can purchase both separately, but you’ll need to disconnect one before connecting the other.
As of August 2023, you cannot control an OSSM over the internet.
Previously, Research & Desire offered a web page for basic WiFi control with speed and depth settings. This feature is no longer available.
As of August 2023, X-Toys firmware is highly experimental and not considered safe for use on humans. Known issues include frequent pauses, position tracking errors, and random extension to maximum depth.
Development of improved X-Toys firmware is ongoing but complex.
Several technical challenges make this integration complex:
  1. Motion core limitations: The current motion system doesn’t support position streaming. A complete redesign of the safety architecture is required—you don’t want accidental rapid movements to maximum depth.
  2. Latency constraints: Experimental testing revealed extremely tight latency margins. Bluetooth communication struggles to meet these requirements.
  3. Data model incompatibility: X-Toys and Buttplug.io don’t support the complex data models OSSM requires. Scaling commands to OSSM’s full stroke length isn’t straightforward. Emulating another toy might work as a workaround, but you won’t have full control over all OSSM features.

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Hardware and Power

No, the reference board is optional. However, it significantly simplifies the build process by eliminating the need for soldering.
The Reference Remote: Wired - Unassembled option includes:
  • OSSM Control Board (PCB) with embedded ESP32 microcontroller
  • Wired Remote Board (the handheld controller circuit board)
You receive both boards unassembled—you’ll need to mount them in their respective enclosures and connect the cables as part of your build.If you purchase the Fully Assembled wired option, these same components come pre-mounted and ready to connect.
The OSSM Control Board contains the ESP32 that runs the firmware. The Wired Remote Board is a separate component that connects to the control board via an Ethernet cable and provides the physical interface (display, knobs, buttons).
The Extrusion Kit (also called “Mount Full Extrusion Kit”) includes:
  • Pre-cut 3030 aluminum extrusion pieces
  • Fasteners (bolts, T-nuts, etc.)
  • Hardware bags for stand assembly
The Extrusion Kit does not include 3D printed parts. You still need to print the pivot plates, extrusion caps, extrusion feet, and other printed components listed in the Stand BOM.If you don’t have access to a 3D printer, you can:
  • Purchase the 3D Printed Parts Kit separately
  • Use a local printing service or maker space
  • Order prints from online services like Craftcloud or JLC3DP
To build a complete stand, you need both the Extrusion Kit (metal parts + hardware) and the printed parts (either self-printed or purchased separately).
Power supply requirements depend on your motor wattage and connection type:24V barrel jack (recommended for maximum performance):
MotorRecommended Power Supply
100W JMC24V, 4A
140W / 180W JMC24V, 6A
Gold Motor (57AIM30)24V, 4A minimum
USB-C Power Delivery (included with DIY kits):If your kit includes a USB-C power adapter, use a USB-C Power Delivery charger with the following specifications:
SpecificationRequirement
Minimum wattage65W
Recommended voltage19V or higher
ProtocolUSB Power Delivery (PD)
USB-C PD adapters deliver slightly less force than a dedicated 24V supply (35 lbs vs 45 lbs). For most users, this difference is imperceptible. If you need maximum force, use a 24V barrel jack power supply.
DIY kit customers who want maximum force: The USB-C adapter included with DIY kits provides 35 lbs of force, which is sufficient for most use cases. If you want the full 45 lbs of force, you can purchase a 24V barrel jack power supply separately from R+D or source one locally.
For safety, use a desktop power supply that is ideally double-insulated. Supplies from reputable distributors (Mouser, Digikey, Conrad, RS) cost more than unbranded units from AliExpress/eBay/Amazon, but unbranded supplies have shown inconsistent quality and long-term stability issues.
International customers (EU, UK, and other regions):Power supplies sold by R+D use North American plugs (Type A/B, 120V compatible). If you’re ordering from outside North America:
  • Option 1: Purchase R+D’s 24V power supply and use a plug adapter for your region’s wall sockets. The power supply accepts 100–240V AC input, so only the plug shape needs adapting—no voltage converter is required.
  • Option 2: Source a 24V, 4A (or higher) power supply locally with your region’s plug type. Ensure it is safety-certified (CE for EU, UKCA for UK) and has a 5.5mm × 2.1mm barrel jack connector with center-positive polarity.
If sourcing locally, verify the barrel jack size (5.5mm outer diameter × 2.1mm inner diameter) and polarity (center-positive) match the OSSM PCB requirements. Incorrect polarity can damage the board.
36V power supply (advanced users):Some users opt for a third-party 36V power supply to increase force output by approximately 20%. While the motor and electronics can handle 36V, there is an important safety consideration:
Always unplug a 36V power supply from the wall socket, not from the barrel jack on the board. Disconnecting 36V from the barrel jack while the supply is still energized can cause voltage spikes that damage the control board. This risk is lower with 24V supplies but still good practice to follow.
Research & Desire does not sell 36V power supplies. If you choose to source one yourself, ensure it is from a reputable manufacturer and rated for at least 4A continuous output.
Rail length determines maximum stroke depth. A 350mm rail provides approximately 195mm of usable depth.Calculate your maximum stroke using this formula: rail length − 180mm = maximum stroke.
Rail LengthMaximum Stroke
350mm (14 in)170mm (7 in)
400mm (16 in)220mm (9 in)
450mm (18 in)270mm (11 in)
500mm (20 in)320mm (13 in)
We do not recommend using a rail longer than 500mm (20 in). Longer rails increase bending and friction under load, which can cause binding, inconsistent motion, and accelerated wear. If you need more stroke, ensure the rail is properly supported along its length.
The end effector uses M24×3 threading.
Print a test piece when creating a new end effector—you may need to upsize by 3-5% depending on your printer’s tolerances.

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Maintenance and Replacement Parts

Yes. Linear rails in OSSM kits ship with factory packaging and a protective coating that prevents corrosion during storage and shipping. Before assembly:
  1. Clean the rail: Wipe down the rail and carriage with isopropyl alcohol or a degreaser to remove the factory preservative coating. Pay attention to the carriage’s ball bearing tracks.
  2. Apply fresh grease: Once clean, apply a light machine grease or linear rail lubricant to the rail surface. Move the carriage back and forth several times to distribute the grease evenly through the ball bearings.
Recommended lubricants:
  • Super Lube synthetic grease (PTFE-based)
  • White lithium grease
  • Any quality linear rail or ball bearing grease
Running the rail without proper lubrication can cause premature wear on the ball bearings and increase friction. A small amount of grease goes a long way—you don’t need to coat the entire rail heavily.
With regular use, certain components may wear out and need replacement. The most common wear items are:
  • Tensioner set (front and rear tensioners): The printed tensioner components experience stress during belt tensioning and direction changes. Cracks or deformation can develop over extended use.
  • Threaded end-effector: The M24×3 threads can wear or strip over time, especially with frequent toy changes or heavy toys.
  • Timing belt: The belt may stretch, fray, or develop cracks after extended high-speed operation.
  • Belt clamps: These grip the belt and can wear or crack under repeated stress.
How quickly parts wear depends on usage intensity, print material, and print quality. Parts printed in stronger materials (PETG, ABS, polycarbonate) generally last longer than PLA.
If you need replacement parts for your OSSM:
  1. Contact support at support@researchanddesire.com
  2. Include your original order number and describe which parts you need
  3. Support will send you an invoice for the replacement parts
If you have access to a 3D printer, you can also print replacement parts yourself using the STL files from the Kinky Makers GitHub repository.
Perform a visual inspection periodically, especially if you notice changes in performance:Before each use:
  • Check that the belt is properly tensioned (no slipping or ratcheting sounds)
  • Ensure the toy mount is secure
Monthly (or every 10–20 hours of use):
  • Inspect printed parts for cracks, especially tensioners and belt clamps
  • Check the threaded end-effector for wear or stripping
  • Examine the belt for fraying, cracks, or excessive stretch
  • Verify all fasteners are tight
Signs a part needs replacement:
  • Visible cracks or deformation in printed parts
  • Belt slipping despite proper tension adjustment
  • Threads no longer grip securely
  • Unusual noises during operation
Continuing to use worn parts can cause further damage or unexpected failures. Replace worn components promptly.