DISCLAIMER: I am not the creator of this product.
In the past, I've been looking for a solution for my Surface Pro 3 that would allow me to easily attach my Surface Pen to the tablet. I've tried several solutions including the Pen Holder that came with the Type Cover and the Cleanit Surface Holder, but I think I have found the perfect one for me and possibly for others.
The solution I found was the Stylus Dock, a 3D printed attachment for the Surface Pro 3 and Surface 3 that attaches with an adhesive strip to the back of a Surface. You quick and easily slide the Surface Pen into the Stylus Dock and it will remain securely in place. The attachment also includes two holes on the bottom that allows air from the fans of the Surface to blow through the Stylus Dock.
This also provides a solution for when I want to keep the Surface Pen with my Surface, instead of having to bring the Type Cover with me that has the Pen Holder attached to it. Now I can bring just the Surface and Surface Pen with me wherever I go and I don't have to worry about it falling out of its holder.
The Stylus Dock comes in four different colors; black, red, white, and blue. I chose the black one since it matched closely to my black Type Cover.
I have included an album of photos that show the Stylus Dock attached to my Surface Pro 3. If you have any questions, feel free to ask.
Album of photos,
Surface Stylus Dock - Album on Imgur
There's two variants of the Stylus Dock,
Surface Pro 3,
Stylus Dock Superior Surface Pen Holder for Microsoft Surface Pro 3 | eBay
SP3 & Surface 3,
Stylus Dock Superior Surface Pen Holder for Microsoft Surface 3 Surface Pro 3 | eBay