Super Pencil Case

This is my first model but it is not completely original. I modeled it amateurishly in TinkerCAD for a long time, like cheating in exams. So please excuse me if there are any mistakes etc. I printed both parts with 0.2mm thick PLA and the bottom part with 5-10% infill.The model consists of two parts and can be printed without support. However, I noticed that the bottom part lifted slightly in my first print and distorted the model. It would be good if you put a brim in the green pipe part.The diameter of the green pipe and the hollow part of the bottom part are the same size. I first made the green pipe 0.1mm smaller and it was a bit loose. Then I equalized the dimensions.