The primary objective for many buyers is to lower the cost of 3D printouts. To do so, we must first understand how 3D printing costs are calculated. The most important variable is most likely the amount of material required for producing your object. So all that remains is to use as little stuff as possible. Is the object being shrunk? Not at all! Like a pro, I'm hollowing it out!

You can save money by not using material that you don't require!



The majority of 3D printing materials are charged per unit. The less you own, the less money you will spend. As a result, a hollow model will be less expensive than a solid form. Hollowing out your object will also keep some materials from deforming

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However, creating a 3D model with an empty interior can be difficult: you must understand how to hollow your model in the 3D modelling software you are using, you must define a wall thickness that is strong enough to prevent your model from breaking, and you should probably include "escape holes" in your model. So, let us tackle these concerns one at a time



Create a hollow 3D model and 3D print it to save money



A hollow model suggests that your object's interior will be hollow. Solid designs are not always a problem because they are stronger and more difficult to break (depending on the material), but they are also more expensive because more 3D printing material is used



If you utilise a hollow model, the interior of your print will be empty (in theory). However, due to the fact that our printers print layer by layer, 3D printing material can become trapped inside your model (see the image in the middle below). If you wish to avoid this, include 'escape holes' in your design. Material that isn't needed for the construction of your 3D print can then be removed






Is a hollow model's wall thickness sufficient?



To make a hollow model, you must create your item with 'walls.' A printer needs to know how thick your product's walls are supposed to be (the "outer shell," if you will. For any 3D printing material, we do not have a 'one-size-fits-all' wall thickness to recommend. Some materials, such as HD Stainless Steel and Titanium, can have very thin walls (minimum wall thicknesses of 0.3 mm and 0.4 mm, respectively), whereas Ceramic requires walls to be at least 4–6 mm thick. The majority of our materials are 1 to 3 mm thick


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Many of you, I'm sure, want to save money by keeping the wall thickness as thin as possible. That makes sense because it means that less material will be used and the print will be cheaper. Keep in mind, though, that making your walls too thin can cause your model to become overly fragile, causing pieces of it to break off. Read our advise on determining the proper wall thickness for your 3D print, and be sure you first read the instructions for your 3D printing material



How can I create a hollow model in my 3D modelling software?


Because each 3D modelling software works differently, hollowing a 3D model is more difficult in some than in others. Nonetheless, we will look at a few examples here



One programme with an easy-to-use hollowing option is 123D Design. It may hollow any shape by selecting'modify' and'shell.' The size of the hollowed space, as well as the thickness of the remaining walls, can then be specified







Other programmes, such as SketchUp, make things a little more challenging. To begin, create a 2-dimensional rectangle and utilise the 'offset' function. As a result, a rectangle within a rectangle will be formed. If you delete this space, your rectangle will be left with an empty space (left hand side in the image below). This two-dimensional shape can then be 'drawn' into a three-dimensional item (right hand side in the image below). Finally, you can add 'walls' at the top and bottom of the design







The free Autodesk software Meshmixer is likely the most straightforward method for creating a hollow model. Insert your 3D file, then select 'edit' and 'hollow' to observe immediate effects






What is the purpose of my need for escape routes?



Our 3D prints are created layer by layer, as previously indicated. 3D printing materials may become caught inside the item if it has a hollow interior. A hollow model filled with trapped powder is susceptible to deformation. Escape holes are suggested for removing 'stuck' 3D printing material from your 3D print (in most situations, this is plastic, metal, ceramic, or wood powder). We frequently use compressed air to remove excess powder







The challenge now is how many escape holes are required in a print and how huge they must be. Again, there is no one-size-fits-all solution: it all depends on the 3D printing material and the size of your design



Consider the following: while we recommend at least two escape holes for multicolor prints, gold, silver, brass, and bronze prints require more. For gold and silver prints, an escape hole of at least 1.5 mm in diameter is permissible; however, apertures for ceramic artefacts must be at least 10 mm in diameter. Again, consulting several design guides will provide you with all of the solutions



How do I create escape routes?



Again, the exact procedure varies according on your software, but the idea is usually the same: build a cylinder at the bottom of your model and then extrude or subtract from its wall (see image below). Meshmixer's hollowing tools even have a mode for automatically generating escape holes







What's preventing you from uploading your 3D file here and ordering it as a 3D print in one of 21 different materials now that you've learned how to generate hollow models and save money on 3D printing? You might also be interested in learning about the five traps to avoid while creating a 3D model for 3D printing