Thingiverse
Vertebral Stacking Blocks by DaveMakesStuff
by Thingiverse
Last crawled date: 2 years, 10 months ago
These vertebral stacking blocks fit together to form a three-quarter size spine model. See here for assembly video: https://youtu.be/z6MckyVLsLw
This model is designed as an interactive way to learn basic spinal anatomy. It is not suitable for young children. If you are looking for a more robust display model, you might consider this design: https://www.thingiverse.com/thing:4863003. If you are looking for a full-size model with more biomechanically accurate movement, you might consider this design: https://www.thingiverse.com/thing:4801717
With the exception of C1 and C2, vertebrae are numbered on the posterior aspect of the vertebral body. The numbers are to assist with assembly and are hidden in the final assembled model. There was only space for numbers, so you’ll have to learn what C1 and C2 look like and be able to differentiate between cervical, thoracic and lumbar vertebrae. (It’s not that hard!)
Every effort has been made to maintain anatomical accuracy; however some small modifications were necessary to optimize the files for printing. In particular, the bone around the transverse foramen in the cervical spine, and the articular processes and lamina of the cervical and upper thoracic vertebrae have been thickened.
Anatomically, the odontoid process of the C2 axis is held in place by the transverse ligament of the C1 atlas. In this model, the transverse ligament has been “ossified” leaving a hole for the odontoid process to click into place. This hole is intentionally tight to hold it in place. Expect to use a bit for force to snap them together, or file down the surfaces of the odontoid process as needed.
Male and female connectors have of course been added to each vertebral body.
Printing:
This is an intermediate project that requires good skills in setting up supports and in post-print cleaning and preparation.
The vertebrae in the files are oriented upside-down to print on the flat surface of the male connector. You will need to set up supports for the rest of the vertebral body. Be especially careful when setting up supports for the downward-oriented superior facet joints. “Tree” supports in Cura work well.
Assembly:
There are some important considerations for post-print clean-up of this model.
The fit between adjacent vertebra must be as tight as possible. Any movement between vertebra, especially the lower ones, will amplify up the spine and you will end up with an unstable spine with very poor posture!
When the pieces come of the print bed the first layer will be protruding out slightly, this is known as the “elephant’s foot.” If you try to connect the vertebra right off the print bed, this elephant’s foot will prevent the male piece from inserting. In order to achieve optimal fit, gradually file off the elephant’s foot while repeatedly attempting to connect the vertebra. As soon as you can forcefully insert the male piece, stop filing! The first few attempts to connect the vertebra should be very tight and difficult. After a few insertions, the surfaces will smooth out and you’ll be left with a nice tight connection.
Do not overdo the filing or you’ll be left with wiggly vertebrae!
This model is designed as an interactive way to learn basic spinal anatomy. It is not suitable for young children. If you are looking for a more robust display model, you might consider this design: https://www.thingiverse.com/thing:4863003. If you are looking for a full-size model with more biomechanically accurate movement, you might consider this design: https://www.thingiverse.com/thing:4801717
With the exception of C1 and C2, vertebrae are numbered on the posterior aspect of the vertebral body. The numbers are to assist with assembly and are hidden in the final assembled model. There was only space for numbers, so you’ll have to learn what C1 and C2 look like and be able to differentiate between cervical, thoracic and lumbar vertebrae. (It’s not that hard!)
Every effort has been made to maintain anatomical accuracy; however some small modifications were necessary to optimize the files for printing. In particular, the bone around the transverse foramen in the cervical spine, and the articular processes and lamina of the cervical and upper thoracic vertebrae have been thickened.
Anatomically, the odontoid process of the C2 axis is held in place by the transverse ligament of the C1 atlas. In this model, the transverse ligament has been “ossified” leaving a hole for the odontoid process to click into place. This hole is intentionally tight to hold it in place. Expect to use a bit for force to snap them together, or file down the surfaces of the odontoid process as needed.
Male and female connectors have of course been added to each vertebral body.
Printing:
This is an intermediate project that requires good skills in setting up supports and in post-print cleaning and preparation.
The vertebrae in the files are oriented upside-down to print on the flat surface of the male connector. You will need to set up supports for the rest of the vertebral body. Be especially careful when setting up supports for the downward-oriented superior facet joints. “Tree” supports in Cura work well.
Assembly:
There are some important considerations for post-print clean-up of this model.
The fit between adjacent vertebra must be as tight as possible. Any movement between vertebra, especially the lower ones, will amplify up the spine and you will end up with an unstable spine with very poor posture!
When the pieces come of the print bed the first layer will be protruding out slightly, this is known as the “elephant’s foot.” If you try to connect the vertebra right off the print bed, this elephant’s foot will prevent the male piece from inserting. In order to achieve optimal fit, gradually file off the elephant’s foot while repeatedly attempting to connect the vertebra. As soon as you can forcefully insert the male piece, stop filing! The first few attempts to connect the vertebra should be very tight and difficult. After a few insertions, the surfaces will smooth out and you’ll be left with a nice tight connection.
Do not overdo the filing or you’ll be left with wiggly vertebrae!
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