BJB TC-5060 mixes 1:1 by volume, so two cups filled to the same marker is perfect, in this case 220mL in each cup. Some mix based on weight and others mix based on volume. To mix silicone depends on brand, tin-cure, and other factors. For our logo which doesn't have any overhangs, is very flat, and has very simple geometry, BJB TC-5060 is a good choice it's a platinum-cure silicone, decently rigid, and comes out as a nice blue.
But between tin-cure and platinum-cure silicones of the same shore hardness, master model, room temperature, etc. Platinum-cure silicone lasts for more castings than tin-cure silicone, all else being equal, and platinum cure silicone resists shrinking as it cures much better than tin-cure. As you might expect, platinum-cure silicone is a lot more expensive than tin-cure. Tin cure actually uses tin to catalyse the reaction and cause the silicone rubber, and the same happens with platinum cure silicone. There's also the choice of tin cure vs platinum cure silicone rubber. Whether to use 60A, 30A, or even 10A is completely dependent on the complexity of the model being molded. The silicone's Smooth-On carries can be as hard as 60a or as soft as 2A (a rubber band is 25A). When an object is rigid, it's shore hardness is measured on a Shore D scale, and when it's fairly flexible it's measured on the Shore A scale. For example, ABS filament has shore hardness of 70D and TPU filament has a shore hardness of 95A. With a box volume of roughly 473 cubic centimeters and a model with a volume of 37 cubic centimeters, I need 436 cubic centimeters of silicone, which equates to 436 mL.Īll objects can be put on a scale measuring its shore hardness, or durometer. By loading a model into netFabb, part of the information that is immediately displayed in the sidebar is its volume cubic centimeters. There are a variety of programs that can tell you the volume of a model, but I use netFabb. But since a 3D print needs a 3D model, you can use that 3D model to get an exact number.
#Halloween 3d prints full#
This works fairly well for small objects, but when you get to a model that utilizes the full build volume of a 3D printer, it becomes impractical to find a container that large or a bag of rice big enough.
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