in this instructable you will learn how to design a custom pencil holder
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Step 1: Get Shapes
open tinkercad and start a new project, then create a cube and the desired hole shape
Step 2: Combine
drag the hole to the cube
Step 3: Group
select the cube and hole and group them
ps. try experimenting with multiple holes
Step 4: Print
now you are ready to print, since this is a simple print you can use an infill of 5-15%