Mechanical Hazards
Body parts caught in mechanism
Body parts caught in mechanism
Vulnerability: Exposed pulleys and bearings create pinch points at the front and rear of the linear rail.Likely consequence: Trauma to tissue
| Role | Mitigation |
|---|---|
| Designer | Provide covers for pulleys and bearings |
| Builder | Install all protective covers |
| User | Avoid placing hands near moving parts |
Hair caught in mechanism
Hair caught in mechanism
Vulnerability: Hair can get dragged into the drive mechanism.Likely consequence: Trauma to tissue, hair loss, potential partial scalping in severe cases
| Role | Mitigation |
|---|---|
| Designer | Provide covers for pulleys and bearings |
| Builder | Install all protective covers |
| User | Tie back hair, avoid leaning over device during operation, position device below waist level |
Dildo screw mount failure
Dildo screw mount failure
Vulnerability: FDM prints can fail along deposition lines, creating sharp splinters or exposing the rail.Likely consequence: Trauma to tissue, internal injuries, cuts and bleeding
| Role | Mitigation |
|---|---|
| Designer | Design screw threads that protect the metal rail; rail should support the thread to reduce FDM stress; specify recommended wall thickness and infill |
| Builder | Use appropriate materials with sufficient adhesion, optimize layer height for strength, use thicker walls and appropriate infill |
| User | Mount toys correctly to reduce stress on the mount |
Interchangeable head failure
Interchangeable head failure
Vulnerability: FDM prints can fail along deposition lines, creating sharp splinters.Likely consequence: Trauma to tissue, internal injuries, cuts and bleeding
| Role | Mitigation |
|---|---|
| Designer | Ensure sufficient strength around likely failure points (screw threads, mounting plates, external walls); design to prevent shards pointing toward user; specify recommended settings |
| Builder | Use appropriate materials with sufficient adhesion, optimize layer height for strength |
| User | Mount toys correctly to reduce stress |
Over-Penetration Hazards
Software fault causing over-penetration
Software fault causing over-penetration
Vulnerability: A software fault causes the OSSM to penetrate too deeply.Likely consequence: Trauma to tissue, internal injuries
| Role | Mitigation |
|---|---|
| Designer | Implement code review and testing; isolate depth and positional controls in tightly managed code sections; design emergency stop that cuts motor power; provide hardware rear stop; design dildo adapters with wide bases as physical stops; recommend safer rail lengths |
| Builder | Use shortest practical rail length; don’t over-specify motor torque; implement emergency stop control |
| User | Maintain ability to move away from hazard; avoid restraints; use shorter toys with wider bases |
Operator error causing over-penetration
Operator error causing over-penetration
Vulnerability: Operator error causes the OSSM to penetrate too deeply.Likely consequence: Trauma to tissue, internal injuries
| Role | Mitigation |
|---|---|
| Designer | Design dildo adapters with wide bases; specify clear stand requirements including weight and dynamic load; specify recommended materials, wall thicknesses, and infill; ensure stands have multiple securing points; ensure stand stability in all dimensions |
| Builder | Use shortest practical rail length; don’t over-specify motor torque; implement emergency stop control |
| User | Maintain operator awareness and communication; don’t adjust while operating; maintain ability to move away; use shorter toys with wider bases |
Stand failure causing over-penetration
Stand failure causing over-penetration
Vulnerability: Stand failure causes the OSSM to penetrate too deeply.Likely consequence: Trauma to tissue, internal injuries
| Role | Mitigation |
|---|---|
| Designer | Design dildo adapters with wide bases; specify clear stand requirements; consider failure modes of FDM and material orientation; specify recommended materials and settings; ensure stands have multiple securing points |
| Builder | Build stands from appropriate materials following designer guidance; use fasteners of sufficient strength |
| User | Maintain ability to move away; use shorter toys with wider bases; use within design parameters; perform hazard assessment if repurposing a design |
Electrical Hazards
Electrical fire from over-amperage
Electrical fire from over-amperage
Vulnerability: Over-amperage results in electrical fire.Likely consequence: Burns, electrocution
| Role | Mitigation |
|---|---|
| Designer | Specify power supplies with correct amperage; design PCB cover to protect high-voltage components; use 50V or less power supplies |
| Builder | Purchase power supplies with correct amperage; install appropriate covers |
| User | Don’t handle with wet hands; don’t touch OSSM body during operation—adjust via the stand |
Fluid contact with electronics
Fluid contact with electronics
Vulnerability: Circuit board is splashed with body fluids.Likely consequence: Burns, electrocution
| Role | Mitigation |
|---|---|
| Designer | Design cover to protect PCB from fluids (cover should protect the user-facing side); design stand orientation to avoid fluid contact and pooling |
| Builder | Implement appropriate cover for your design and stand combination |
| User | Use within design parameters; perform hazard assessment if repurposing a design |
EMI causing unpredictable movement
EMI causing unpredictable movement
Vulnerability: Electromagnetic interference from a poor quality power supply causes unpredictable movement of the effector via the wired remote.Likely consequence: Trauma to tissue, internal injuries
This hazard was reported by a community member using an unbranded budget power supply. The issue was resolved by substituting a quality PSU from a reputable manufacturer.
| Role | Mitigation |
|---|---|
| User | Use good quality power supplies from reputable manufacturers |
Security Hazards
Malicious remote control
Malicious remote control
Vulnerability: A malicious remote user takes over internet remote control during manual operation, causing over-penetration.Likely consequence: Trauma to tissue, internal injuries
Dual control capability is often used in remote scenarios with inexperienced operators. Consider whether an override option is appropriate for your use case.
| Role | Mitigation |
|---|---|
| Designer | Implement remote control lockout during local control by default; require remote enablement after each restart |