Another in my series of pencil/pen/marker/brush holders.
I know what you are thinking, "Why is the STL file just a block?" Well, yeah. It -is- just a block. And any block will do.
This pencil holder is more about technique than modeling. Just model up any rectangular block that is the size that you need.
Set the infill to 7% or 8% with 2 shells.
When you are printing, just cancel the print before it prints the top layers to your block. Voila! A pencil holder, with slots for each pencil, that you didn't spend any time modeling up.
Tips: Stick to rectangular blocks, as they have the most clear cells. Try rotating the block 60 degrees to the left or the right while slicing to see which orientation results in the most usable cells.
The most important bit is to set the infill to 7% for fat pens or 8% for pencils and such.
The rest is up to your personal preferences.