d20 Box

thingiverse

Magnetic closure d20 box to store your goodies. It neatly fits 3mm diameter x 2mm height cylinder magnets. I've attached the Fusion360 file if you want to tweak the size or font. Change the size by modifying the "MajorRadius" parameter, which defines the radius of a sphere that circumscribes the icosahedron. Change "MagnetDiameter" and "MagnetDepth" for the dimensions of your magnets - I found I need about 0.1 mm extra on the diameter to make them fit. The font I used doesn't extrude the insides of the 9, so I flipped a 6 for the 9 and 19 faces. You'll have to manually adjust the intra-letter spacing if you change the font. Setting the "MajorRadius" to 1.8 inches is the max that would fit on the print bed of my Photon Mono 4k. You may have to rotate it around the z-axis by 18 degrees to fit the most possible in your print bed. I tried to find a way to print without supports, but mostly failed. I tried printing with the magnets opening against the build plate, but the magnet holes filled with resin and printed solid. I tried printing with one face touching the build plate, but that number was obliterated. Printing with one tip supported seems to work best for me. The vertical supports didn't really seem to do much (they broke off totally cleanly, barely making contact with the model), so I think they can be omitted (at least they could on my printer with this resin). If you want to remove all the supports, in Fusion 360, hide the "Supports" components. If you do find the supports necessary, You'll probably have to make them thicker (adjust the "SupportPillarRadius" parameter) or have more contact with the surface ("SupportPenetration" or "SupportPillarRadius"). The middle support seemed to be enough to stick the model to my build plate, but it tended to hold resin in the crevice, making it thicker than designed. This was my first time printing with clear resin. I learned that the UV light will shine through the walls and activate any liquid resin rolling around inside the shell. This particularly was a problem when printing with the opening sealed against the build plate. This left half a teaspoon of resin flowing loose inside the structure. It eventually hardened to give the inside a rippled finish, that I really didn't like.