Based on this Russian page (I see the text above is in Russian), it looks like the plans are available from Loyal Hanna / Taubmans http://modelyard.narod.ru/english/draw/ger/470.htm
Here's a link to a nice digital model of the ship. https://gamemodels3d.com/games/worldofwarships/vehicles/pgsc506 Click on the 3D Model button to view. Once there you can spin and zoom to whatever location you want to see
I ran across these https://cults3d.com/en/3d-model/game/rc-dkm-admiral-graf-spee-144-scale plans on cults3d. It's not free but it looks like a good starting place.
Those files are uploaded by forum member @darkapollo. If I was going to just buy some files and download them and print them I would 100% trust what he has put out more than anything else available on the internet.
Thanks for the plug. Those are indeed my files. They would need to be extensively modified for combat use.