| Hazard | Vulnerability | likely consequence | Design mitigation | Build mitigation | User mitigation | Notes |
|---|---|---|---|---|---|---|
| Body parts caught in OSSM mechanism | Exposed pullies and bearings | Trauma to tissue | Cover for pully and bearings | Apply cover | ||
| Body parts caught in OSSM mechanism | Pinch point front and rear of linear rail | Trauma to tissue | Cover for pully and bearings | Apply cover | User avoids placing hand in area | |
| Hair caught in OSSM mechanism | Users hair gets dragged into OSSM drive mechanism | Trauma to tissue, loss of hair, worst case partial scalping | Cover for pully and bearings | Apply cover | Operator does not lean over OSSM in use. Tie back hair. Use of OSSM only below waist. Full enclosure in skin tight latex (just to see if anyone else reads this) |
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| Failure of dildo screw mount | FDM prints can fail along deposition lines resulting in sharp splinters or exposed rail | Trauma to tissue, internal injuries, cuts and bleeding. | Screw thread protects the metal rail. The rail supports the thread reducing stress on FDM part. Recommended settings for wall thickness and infill. |
Builder must use appropriate materials with sufficient adhesion (temperature), layer height optimized for strength. Thicker walls and appropriate infill | User ensures any toys are correctly mounted to reduce stress. | |
| Failure of interchangeable dildo head | FDM prints can fail along deposition lines resulting in sharp splinters | Trauma to tissue, internal injuries, cuts and bleeding. | Designers ensure there is sufficient strength in designs around likely failure points such as screw thread, mounting platters and external walls. Design to avoid possibility of shards pointing in direction of OSSM movement towards the user. Recommended settings for wall thickness and infill. |
Builder must use appropriate materials with sufficient adhesion (temperature) layer height optimized for strength. Thicker walls and appropriate infill | User ensures any toys are correctly mounted to reduce stress. | |
| OSSM penetrates too deeply | Due to a software fault the OSSM penetrates too deeply injuring the user | Trauma to tissue, internal injuries. | Code review and testing. Software architecture that isolates depth and positional controls into specific section of code that is tightly managed. Design for an emergency stop that cuts power to the motor Provision of hardware rear stop to reduce effective rail length. Dildo adaptors with wide platter/bases to act as a physical stop. Recommendation of “safer rail lengths” to engineer a control. Introduction of position for use cases requiring a longer rail. |
Use as shorter rail as possible to minimize risks Do not over specify motor to reduce available torque. Implement emergency stop control for stepper motor. |
User of machine should be able to move away from hazard. Avoid restraints Shorter toys with less depth Toys with wider bases that cannot “over penetrate” |
GPIO and software controls do not effectively mitigate risks as in the case of software failure they will not interrupt in sufficient time. |
| OSSM penetrates too deeply | As the result of operator error the OSSM penetrates too deeply injuring the user | Trauma to tissue, internal injuries. | Dildo adaptors with wide platter/bases to act as a physical stop. Identify clear requirements for stands including weight and dynamic load. Consider failure modes of material and manufacturing techniques such as FDM and model orientation. Specify recommended materials, wall thicknesses and infill percentages. Ensure stands have multiple points securing each adjustment point. Ensure stands are stable in all dimensions. |
Use as shorter rail as possible to minimize risks Do not over specify motor to reduce available torque. Implement emergency stop control for stepper motor. |
Operator awareness and communication. Do not make physical adjustments when OSSM is operating. User of machine should be able to move away from hazard. Avoid restraints Shorter toys with less depth Toys with wider bases that cannot “over penetrate” |
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| OSSM penetrates too deeply | Due to the failure of a stand the OSSM penetrates too deeply injuring the user | Trauma to tissue, internal injuries. | Dildo adaptors with wide platter/bases to act as a physical stop. Identify clear requirements for stands including weight and dynamic load. Consider failure modes of material and manufacturing techniques such as FDM and model orientation. Specify recommended materials, wall thicknesses and infill percentages. Ensure stands have multiple points securing each adjustment point. Ensure stands are stable in all dimensions. |
Make stands from appropriate materials using designer guidance. Ensure hardware and fasteners are of sufficient strength. |
User of machine should be able to move away from hazard. Avoid restraints Shorter toys with less depth Toys with wider bases that cannot “over penetrate” Use your specific OSSM within the design parameters and if repurposing a design perform a hazard assessment. |
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| Electrocution | Over amperage results in electrical fire | Burns, electruction | Specify power supplies with correct amperage Design PCB cover to protect higher voltage components Use 50V or less power supplies. |
Purchase power supplies with correct amperage Include appropriate cover in build |
Do not handle with wet hands. Do not touch body of OSSM when in operation adjust via the stand. |
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| Electrocution | OSSM circuit board is splashed with body fluids | Burns, electruction | Design cover to protect PCB from body fluids. This implies PCB cover should protect the side of the board facing the user. Stand designers design OSSM orientation and position to avoid contact with fluids and reduce the risk of pooling. |
Implement appropriate cover for design and stand combination. | Use your specific OSSM within the design parameters and if repurposing a design perform a hazard assessment. | |
| Malicous use | A remote malicous user takes over internet remote control of users OSSM when in manual operation injuring the user via over penetration | Trauma to tissue, internal injuries. | Remote control lock out when local control is being used by default. Software to allow configuration that is per powercycle. Remote must be enabled after each restart. |
Dual control ability is often used in remote estim with inexperienced drivers. Maybe an override? | ||
| Electro Magnetic Interference (EMI) | EMI from a poor quality power supply causes unpredicatble movement of the OSSM effector via the wired remote | Trauma to tissue, internal injuries. | Use good quality power supplies from a reputable manufacturer. | This hazard was reported by a community member when they used a budget unbranded power supply. Issue resolved with substitution of good quality PSU |