This is a simple calibration test cube for your 3D printer with X, Y & Z written on the axis.
To further calibrate your 3D printer print one out and you can then measure this models dimensions against the expected dimensions.
Once this is done you are able, if your 3D printer allows it, to adjust your Steps per mm in your printers firmware.
if:
e= expected dimension
o = observed dimension
s = current number of steps per mm
then:
(e/o) x s = your new number of steps per mm
In part though this is the result of a guide on how to make your own 3D printer calibration cube using Freecad ( https://www.idig3dprinting.co.uk/news/how-to-guides/create-a-3d-printer-calibration-cube-in-freecad/ )
So why not have a go at making your own!

Creative Tools Creative Tools supplies 3D printer and 3D scanner products incl filaments, accessories and support and also 3D software for leading CAD, modeling, animation, and rendering.
#3DBenchy is a 3D model designed by us at Creative Tools specifically for testing and benchmarking 3D printers. It is a small recognisable object that you can download for free, make and share.  
It is designed to 3D-print quickly and be a fun tool for calibrating your 3D printer. There is a single-part STL file for 3D printing the boat in one material, and a multi-part STL assembly to suitable for multi-material/printhead 3D printing.  
Documenting the results
You can use the Smartphone Photo Studio for 3DBenchy to easily take photos and share the results of your 3D print. http://www.thingiverse.com/thing:1085472
Makes
If you desire, please take pictures and post them here as makes with a short description of your 3D-print settings. For more information about 3D-print settings please read this post.  
Troubleshooting and community…

UPDATE [15/8/2020]
Since this model got way more popular than i eventually thought, I'd love to spread more help and tinkering across this community.
If you want to participate, feel free to follow me on twitter or join my discord server, if you need any help, you can reach me out anywhere else...
Hit me up:https://twitter.com/MarianTrpkos
Other media...https://linktr.ee/majda107
Guides below are outdated, but still may help, I'll try to create new one in near future, so be sure to stay in touch with me!
I am planning some more cool models here on thingiverse!
Are you suffering from issue and can't find any way to fix it?!
Be sure to checkout guide specified to this model, guide isn't complete yet (23.8.2018) but there are some cool tweaks you should definitelly know!https://3dnation504795197.wordpress.com/guide/
Here is link for those people, who wan't to support me, it won't cost you any money, only 5 seconds of your time. So If you want to support me (without any fees), go to the guide this way! Thanks <…