It's a pen holder with the shape of a tree stump.
I attached a tree hole for, in my case, small eraser but turned out to be slightly too small on the first try (the v1 file, and the printed one). So I tweaked it and made the v1_1 file but didn't feel like to reprint it for now.
這是一個樹樁造型的筆筒。
我在一側加上了一個樹洞,希望能用來放橡皮擦。但印出來之後卻發現稍微小了些,因此調整了v1的檔案,設計了v1_1。只是,v1似乎還是堪用,所以目前是懶得再重新印了。