I designed this to hold a round sharpening stone from Norton. I have two of them, the IB64 and the JB64. I designed this box so that the top and bottom are exactly the same. All you need to do is print two of the same part.
I do plan to use these magnets and this E6000 Craft Adhesive to hold the box closed when not in use. That's what the 4 indentations are for.
I ordered these 3mm brass rods to use as the hinge pins.
I'm still waiting on the hinge pins, but I printed it and tested it. The hinge is a fairly tight friction fit, but that helps keep it open. Overall, I'm pretty happy with the outcome.
I will use a 3mm drill to make a cleaner more consistent hole in the hinge plastic before I insert the brass rod, but I don't anticipate any issues with that.
Parts: (in case the amazon links don't work)
1) BYKES Neodymium Super Strong Extremely Powerful Rare Earth Refrigerator Magnets 1/2" X 1/16" N42 - Set of 80
2) uxcell 3mm Dia 250mm Length Brass Round Rod Shaft for RC Toy Car
3) E6000 237032 Craft Adhesive, 2 fl oz Clear
4) HATCHBOX PLA 3D Printer Filament, Dimensional Accuracy +/- 0.03 mm, 1 kg Spool, 1.75 mm, Blue
I didn't use any supports for the overhanging hinge, but it printed fine. I did use a 10mm brim around the whole box because it's a large flat surface and I didn't want the edges to lift and warp the box. This worked fine and since the box is a square, it was very easy to remove them without ever knowing they were there.
Bed Temp: 60C
Hatchbox PLA Temp: 195C