This is a simple retraction test that will help you find the best settings that will print your 3D printed models with the least amount of stringing. As the picture show the total height of the model is 35mm. So, start with 0 retraction settings and go up by 5mm (or 5 layer No.) for a total of 6 test settings. You can reprint that using different settings for retraction speed as well so, easy beezy :)

Update: Just added another version of the same model but with a thinner bottom. This is just for those who are good at math or want to save some time on printing while spend it on calculating the layers -_-'

Latest Update: Another version was just added recently for a retraction test that can be used for longer distance. Just choose the best one that will suit your need. I also included single towers to make it more customizable. Hope you find that helpful!