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Commercial_Components/Battery-Contact-Plates.md

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- **Plate Height Spacing:** The distance between the center of the battery tube and the bottom of the plate retaining slot.
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- **Plate Width Spacing:** The distance between the centers of the two battery tubes.
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<img src="Photos/Battery_Contact_Plate/Battery_Contact_Plate_IMG17.png" width ="300" alt="A cross section of the Musical Grasping training aid with the plate width and the plate height labeled.">
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<img src="Photos/Battery_Contact_Plate/Battery_Contact_Plate_IMG17.png" width ="300" alt="A cross section of the Musical Grasping Training Aid with the plate width and the plate height labeled.">
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| Contact Plate Positioning Measurements | |
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| :--------------------- | -----: |

Commercial_Components/Cable-Ties.md

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<img src="Photos/Cable_Tie/Cable_Tie_Bundle.png" width="300" style="display: block; margin: 0 auto" alt="A bundle of cable ties. ">
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The cable ties used in most MMC projects require at least 3 mm of width, and 1 mm of thickness. When the cable tie runs along the exterior of the device, like the ones found at the bottom of the [Open Rocker Switch](https://github.com/makersmakingchange/Open-Rocker-Switch), be aware that it will not bend a perfect 90 degrees and will either need a radiused bend or a slightly deeper channel to allow it to lie flush with the exterior of the device. If it is in the interior bottom of the device, a fillet along the bottom makes it easier to insert the cable without it getting stuck, as seen in the [Spruce joystick](https://github.com/makersmakingchange/Spruce-Mini-Joystick)
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The cable ties used in most MMC projects require at least 3 mm of width, and 1 mm of thickness. When the cable tie runs along the exterior of the device, like the ones found at the bottom of the [Open Rocker Switch](https://github.com/makersmakingchange/Open-Rocker-Switch), be aware that it will not bend a perfect 90 degrees and will either need a radiused bend or a slightly deeper channel to allow it to lie flush with the exterior of the device. If it is in the interior bottom of the device, a fillet along the bottom makes it easier to insert the cable without it getting stuck, as seen in the [Spruce Joystick](https://github.com/makersmakingchange/Spruce-Mini-Joystick)
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## Dimensions
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Commercial_Components/M3-Nut.md

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## M3 Nut
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M3 nuts are used to add threads to a project, typically in a pair to allow for the attachment of a mounting adaptor like the RAM B adaptor or the ¼-20 Camera mount adaptor.
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M3 nuts are used to add threads to a project, typically in a pair to allow for the attachment of a mounting adaptor like the RAM B adaptor or the ¼-20 Camera Mount adaptor.
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<img src="Photos/M3_Nut/M3_Nut_IMG1.png" width="300" style="display: block; margin: 0 auto" alt="a picture of an M3 nut">
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Commercial_Components/SheetMetalScrew.md

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# #4 Sheet Metal Screw
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Used to hold 3D printed parts together, usually the two halves of the enclosure or other structural connections. The screw most used in MMC devices is a 3/8” #4 Sheet Metal Screw
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[Test Link to Other page in the repo](https://bradleywell.github.io/OpenAT-Design-Guide-Test/Cable-Ties.html)
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Used to hold 3D printed parts together, usually the two halves of the enclosure or other structural connections. The screw most used in MMC devices is a 3/8” #4 Sheet Metal Screw.
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<img width="436" height="303" style="display: block; margin: 0 auto" alt="image" src="https://github.com/user-attachments/assets/9854d526-f88e-4fbe-ae1e-c3b95520f021" />
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Design_Elements_For_3D_Printed_Parts/Battery-Covers.md

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# Battery Covers
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When using a 9V battery, it is important to have the battery accessible to the user, but still protected, secure, and out of the way. In the Open Playback recorder, this is done with a battery cover similar to what you would find in a television remote.
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When using a 9V battery, it is important to have the battery accessible to the user, but still protected, secure, and out of the way. In the Open Playback Recorder, this is done with a battery cover similar to what you would find in a television remote.
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<img src="Photos/Battery_Cover/Battery_Cover_IMG1.png" width="300" alt="A battery cover holding a 9V battery. "><img src="Photos/Battery_Cover/Battery_Cover_IMG2.png" width="300" alt="The battery cover with a 9V battery installed into the open playback recorder. ">
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Design_Elements_For_3D_Printed_Parts/Captured-Buttons.md

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When the switches are facing the side of the enclosure, it is slightly more difficult to design a captive button element. The same constraints apply, the button needs to be close enough to the electrical button, the button needs to be constrained side to side, the button needs to be restrained from falling out of the enclosure, and the button needs to be constrained from rotating. However, when the button is horizontal, it is more difficult to implement these constraints.
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The only device in the MMC library that currently uses this style of button is the Open Playback Recorder. In the Open Playback recorder, the button is constrained side to side by the top and bottom of the enclosure, and both oriented/constrained from rotating and kept in the enclosure by a peg in the bottom enclosure that fits into a slot in the captured button. The peg is not the ideal method of capturing the button, as it can snap off and is a point of failure. The chamfered edge method used on the LipSync Hub buttons is less likely to fail, and the button is already prevented from rotating due to its octagonal shape.
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The only device in the MMC library that currently uses this style of button is the Open Playback Recorder. In the Open Playback Recorder, the button is constrained side to side by the top and bottom of the enclosure, and both oriented/constrained from rotating and kept in the enclosure by a peg in the bottom enclosure that fits into a slot in the captured button. The peg is not the ideal method of capturing the button, as it can snap off and is a point of failure. The chamfered edge method used on the LipSync Hub buttons is less likely to fail, and the button is already prevented from rotating due to its octagonal shape.
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<img src="Photos/Captured_Buttons/Captured_Buttons_IMG4.png" width="300" style="display: block; margin: 0 auto" alt="The captured button from the open playback recorder with the retaining peg labeled. ">
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Design_Elements_For_3D_Printed_Parts/Capturing-A-PCB.md

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## Screws
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<img src="Photos/Captured_PCB/Captured_PCB_IMG1.png" width="400" style="display: block; margin: 0 auto" alt="A cross section of the lipsync hub showing the PCB screwed into place. ">
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<img src="Photos/Captured_PCB/Captured_PCB_IMG2.png" width="400" style="display: block; margin: 0 auto" alt="A cross section of the LipSync hub with a post supporting the arms of the PCB. ">
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<img src="Photos/Captured_PCB/Captured_PCB_IMG1.png" width="400" style="display: block; margin: 0 auto" alt="A cross section of the Lipsync Hub showing the PCB screwed into place. ">
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<img src="Photos/Captured_PCB/Captured_PCB_IMG2.png" width="400" style="display: block; margin: 0 auto" alt="A cross section of the LipSync Hub with a post supporting the arms of the PCB. ">
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When attaching a PCB using screws, one or more screws are used to attach the PCB to the enclosure. The design specifics for the screws can be found in the #4 Sheet Metal Screw entry in the commercial parts section, while the design specifics for the screw posts can be found in the Screw Posts entry in the 3D printed parts section.
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Design_Elements_For_3D_Printed_Parts/Design-Elements-for-3D-Printed-Parts.md

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In this section, the 3D printed mechanisms used in some devices are described. This section has less of a focus on measurements than the previous section since there are fewer constraints than when working with fixed dimension commercial parts. Some dimensions will be mentioned when they are critical/are a maximum or minimum size.
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# Design Elements
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This section includes guides on how to include:
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---
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Copyright (c) 2025 Neil Squire / Makers Making Change.
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This work is licensed under the [CC BY SA 4.0 License](http://creativecommons.org/licenses/by-sa/4.0)
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This work is licensed under the [CC BY SA 4.0 License](http://creativecommons.org/licenses/by-sa/4.0)
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# Design Elements
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This section includes guides on how to include:

Design_Elements_For_3D_Printed_Parts/Lever-Arm-Button-Pusher.md

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The ‘lever arm’ button pusher is used in the Forest Hub and several other devices to create a section of the enclosure that can be used to press internal buttons on a PCB or microcontroller.
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<img src="Photos/Lever_Arm/Lever_Arm_IMG1.png" width="300" style="display: block; margin: 0 auto" alt="A cross section of the forest hub showing the button pusher arm. ">
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<img src="Photos/Lever_Arm/Lever_Arm_IMG1.png" width="300" style="display: block; margin: 0 auto" alt="A cross section of the Forest Hub showing the button pusher arm. ">
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The primary considerations when creating the button pusher is print orientation and length of the arm. Since the arm needs to be printed as a cantilever with the layer lines running through it, the only feasible angle to print it on is the bottom print surface, printing directly on the bed. Printing it in any other orientation would require large amounts of support material or will print too weak and will break when used.
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<img src="Photos/Lever_Arm/Lever_Arm_IMG2.png" width="300" style="display: block; margin: 0 auto" alt="the forest hub enclosure in the bambu slicer, showing print orientation . ">
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<img src="Photos/Lever_Arm/Lever_Arm_IMG2.png" width="300" style="display: block; margin: 0 auto" alt="the Forest Hub enclosure in the Bambu slicer, showing print orientation . ">
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The lever section of the arm needs to be long enough to deflect and bend without requiring significantly more force to operate than the button. The lever arm is generally between 2.4 to 6 mm wide, and at least 6 mm long. The end of the lever should have a cone, post, or other protrusion that rests within a millimeter or two of the button on the PCB so that the button is pressed almost immediately after pressing the lever arm.
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Design_Elements_For_3D_Printed_Parts/Non-Slip-Base.md

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# Non-Slip Base
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Some of the OpenAT joysticks, such as the Willow, come with a non-slip base that helps them stay in one place while being used on a table or other flat surface. This base uses the mounting standard used in the camera mount adapter and the Ram-B ball adapter to stay in place, and several non-slip feet to prevent it from moving around on the surface.
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Some of the OpenAT Joysticks, such as the Willow, come with a non-slip base that helps them stay in one place while being used on a table or other flat surface. This base uses the mounting standard used in the camera mount adapter and the Ram-B ball adapter to stay in place, and several non-slip feet to prevent it from moving around on the surface.
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG1.png" width="300" style="display: block; margin: 0 auto" alt="A photo of the Willow joystick with the non slip pase. ">
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG2.png" width="300" style="display: block; margin: 0 auto" alt="The non slip base of the willow joystick. ">
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG1.png" width="300" style="display: block; margin: 0 auto" alt="A photo of the Willow Joystick with the non slip pase. ">
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG2.png" width="300" style="display: block; margin: 0 auto" alt="The non slip base of the Willow Joystick. ">
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To create a non-slip base, create a sketch on the bottommost surface of the device, and project the walls of the device down. Create a clearance offset of 0.1 mm, and a second offset 1.6 mm beyond that. Extrude this ring up, the distance will vary depending on how much of a chamfer there is on the base of the device.
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG3.png" width="300" style="display: block; margin: 0 auto" alt="The base of the oak joystick, with a sketch offsetting the perimeter . ">
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG4.png" width="300" style="display: block; margin: 0 auto" alt="The oak joystick with the perimeter being extruded up. ">
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG3.png" width="300" style="display: block; margin: 0 auto" alt="The base of the Oak Joystick, with a sketch offsetting the perimeter . ">
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<img src="Photos/Non_Slip_Base/Non_Slip_Base_IMG4.png" width="300" style="display: block; margin: 0 auto" alt="The Oak Joystick with the perimeter being extruded up. ">
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Next, extrude the base down by 2.4 mm, leaving the mounting holes uncovered. Chamfer the interior corner of the base as needed to match the chamfer on the bottom of the device, and chamfer the bottom of the non-slip foot, generally 1.6 mm but this can be changed to keep the thickness more consistent if the chamfer on the bottom of the device is significantly larger or smaller than that.
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