Simple tray support

Simple and super 3D printing consumable material disk bracket, need to purchase 4 R188 bearings separately 简易超级的3D打印耗材料盘支架，需要单独购买4个R188轴承 New version 2.0新增版本V2.01.Increase the size of the tray, support ≤ 70mm. 2.Increase the hollowed-out design and reduce the loss of consumables. 3.Increase edge fillet 1.增大料盘摆放尺寸，支持料盘厚度≤70mm 2.增加镂空设计，减少耗材损耗 3.增加边缘圆角