Mountable pen holder

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I designed this to mount on a fish tank breeding rack to holder markers and pens. I put three small holes in the bottom for drainage should water splash into it. Two mounting holes to use to screw to whatever it needs to be mounted to.

Should hold a couple markers and a pen. I have not yet printed it, so I can't guarantee capacity.

Mounting holes are size for a 1/8" screw or a M3 wood screw. Holes are not countersunk, so I recommend using a pan head or similar headed screw.

UPDATE: Printed off my design and went to mount it. The mounting tab at the top broke off due to bad layer adhesion. Added new design with side tabs to prevent this from happening again. I am printing at lower quality settings to save time and because I don't need high detail for a simple pen holder.