Polhemus Transmitter Box Holder

Mounting bracket for the transmitter from a Polhemus Fastrak Digitizer system. We use this system to digitize the location of sensors when they are worn by a subject using the Brainstorm Toolbox for MATLAB (http://neuroimage.usc.edu/brainstorm/).

The transmitter needs to be mounted on the back of a chair, but there isn't an off-the-shelf solution for this problem. We made one.

1/23/15
TransmitterBox_FlatBack_3.14.stl was found to be a bad file, it has been replaced.

1/12/15
Added TransmitterBox_FlatBack_3.14
This is the 'final' version of the model with a flat back. The size of the access holes to allow for easier marking of the pilot hole location.

1/9/15
Added TransmitterBox_CurvedBack_3.13
Printed this out, mounted it and it works great for the chair that I have. Access holes have been increased in size to accommodate a pencil. I'm considering this the 'final' for the curved model. The only minor issue is that there is slightly more play than necessary in the Y direction when the transmitter is installed. Other than that it is great.
The only possible improvement at this time would be to create 4 holes in the bottom of the holder so that you could run some screws up through it and into threaded holes in the transmitter. I think that this is overkill, so I'm going to call this good until someone convinces me otherwise.

Share and enjoy.

1/8/15
Added TransmitterBox_CurvedBack_3.11
This model has slightly bigger access holes in the hopes that a pencil will fit through to aid marking. A curved back was also added to accommodate chairs with a curved back.
This model is being printed for further testing.

1/5/15
Version 3.9 is installed on a chair and was used successfully during a subject visit. The researcher loved it. The design will only get better from here.
This model will be replaced once the access hole size has been determined.

12/29/14
Version 3.9 is now in a usable state. This was a modification of version 3.8, which needed the position and size of the cord notch adjusted. I am going to do a final print of this, but test the printout that I modified manually.

This was printed in PLA, but would be better in ABS. This is doubly true if your chair back has a curve to it. My test model cracked a bit due to poorly spaced pilot holes, so be careful of that.

Please download, print, test and comment regarding this thing.

Future Improvements?
I'm happy with this, but I may further modify it to take into account the curve of the chair back I happen to be using.

Additionally, marking the lower pilot holes accurately is difficult since the access holes are big enough for a screwdriver, but not a pencil. I may have to address that as well.

12/23/14
Version 3.4 has some issues with hole sizing, so it currently doesn't work. X dimension works, Y is a little sloppy. Walls are a bit thin, will adjust to 3mm vs 2mm. Heights need adjusting as it's all too short at the moment.

Developed by Graham Holt (https://www.linkedin.com/profile/view?id=32946354)
Laboratory of Cognitive Neuroscience (http://www.childrenshospital.org/research-and-innovation/research/labs/laboratories-of-cognitive-neuroscience)
Boston Children's Hospital (http://www.childrenshospital.org/).

This object was modeled in FreeCAD (http://www.freecadweb.org/).