You can use the following link as a shelf
https://makerworld.com/zh/models/87631#profileId-93777
I USE eSUN PLA+
Start with Red
At layer #10 (0.88mm) swap to Orange
At layer #13 (1.12mm) swap to Yellow
At layer #19 (1.6mm) swap to White
At layer #25 (2.08mm) swap to Orange or the rest. (outer frame)
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.