Update 14-7-2019 :
I finished the project and will upload all the files and code as is.
This is for a learning/hobby building project to do precise temperature control in my 3D printed enclosure, while also using the (waste) heat to dry filament storage above.
The setup I'm building uses just cheap continues rotating servo's and does end stop recognition by sensing changing current draw if servo is stalling.
More details, parts and script for the (IKEA LACK) 3D printing enclosure will follow. But I thought I would share this part already for people who want to use this for other projects, like on case modding of pc's 120mm fans ;).
More to come!