Vertical 4 pens holder

Have you always felt bugged because the pens on your desk penholder leans to the side? Well, I have! You can replace the internal insert to change the fitment for your favorite pen.The file include support to Pentel mechanic pencil, Mitsubishi Uniball and a Lammy Inc pen, you can modify and/or design your own inserts too, please share if you do! The .step files are included to ease modifications.