The file '5x3mm Pen Holder Fridge Magnet 3D Printer Model' is (stl) file type, size is 54.3KB.
Had some 5x3mm magnets lying around so remixed this to fit those. Just imported the .stl file into tinkercad to modify the original. All I did was cover the holes and add three smaller holes.
The holes were a little small so I just used a small knife to trim the edges. No superglue needed as the magnets fit right in after taking some of the material out.
Remixed from: https://www.thingiverse.com/thing:4823628
5x3mm_Pen_Holder.stl | 131.1KB |