Bottlenecks are very difficult to handle. If possible, it is necessary to avoid such places requiring processing, to which it is impossible to get close with sandpaper or micro drill. Of course, you can process the surface in a bath with a solvent, but then small elements will melt.
Accuracy in the XY axes depends on the backlash, structural rigidity, belts, in general, on the mechanics of the printer. And is approximately 0.3mm for hobby printers. The Z-axis accuracy is determined by the layer height (0.1-0.4 mm). Hence the height of the model will be a multiple of the layer height. It is also necessary to take into account that after cooling, the material shrinks, and with this the geometry of the object changes. There is also the software side of the problem. not every slicer processes the internal dimensions correctly, so it is better to increase the hole diameter by 0.1-0.2 mm.
Minimum overhanging parts
Each overhanging element requires a supporting structure. support. The fewer overhangs, the less support you need, the less material and print time you need to spend on them, and the cheaper it will be to print. In addition, the support spoils the surface in contact with it. Allowed to print without wall supports, which have an angle of inclination not more than 70 degrees.
Here’s how to position the model on the desktop depends on its strength. The load should be distributed across the print layers, not along. Otherwise, the layers may separate, because K. The adhesion between the layers is not 100%. To make it clear, let’s take a look at the two L-shaped models. Lines show print layers.
This is how the strength of the layers depends on the strength of the printed part. In this case, a small force will be enough for the right “G” to break it.
Small details are quite difficult to reproduce on an FDM printer. They cannot be reproduced at all if they are smaller than the nozzle diameter. In addition, during surface treatment, small details will become less visible or disappear altogether.
A desirable but not required rule. A flat base will help the model to better stay on the printer table. If the model peels off (this process is called delamination), then the geometry of the base of the model will be violated, and this can lead to a shift in the XY coordinates, which is even worse.
If the model does not have a flat base or the base area is small, then it is printed on a raft. a printed substrate. Raft spoils the surface of the model it touches. Therefore, if possible, it is better to do without it.
10 rules for preparing a model for 3D printing
I downloaded the model, printed it out, use it. what could be easier!? But, speaking of FDM 3D printers, it is not every model that can be printed, and almost every model (not prepared for 3D printing) has to be prepared, and for this it is necessary to imagine how this 3D printing goes. First, a couple of definitions: Slicer is a program for converting a 3D model into a control code for a 3D printer. (There are plenty to choose from: Kisslacer, Slic3r, Skineforge, etc.). It is necessary since K. The device will not be able to immediately eat a 3D model (at least not the printer in which we are talking). Slicing (slices). the process of translating a 3D model into a control code.
The model is cut (sliced) in layers. Each layer consists of a perimeter and / or fill. The model can have a different percentage of filling with fill, also there can be no filling (hollow model). Each layer moves along the XY axes with the deposition of plastic melt. After printing one layer, the Z axis moves one layer higher, the next layer is printed, and so on.
Walls Should be equal to or thicker than the nozzle diameter. Otherwise, the printer will SIMply not be able to print them. The wall thickness depends on how many perimeters will be printed. So with 3 perimeters and 0.5mm snot, the wall thickness should be from 0.5, 1, 1.5, 2, 2.5, 3mm, and over can be any. That is, the wall thickness must be a multiple of the nozzle diameter if it is less than Nd, where N is the number of perimeters, d is the nozzle diameter.
When modeling, it is necessary to take into account the maximum possible print dimensions. If the model is larger than THESE dimensions, then it must be cut to print in parts. And since these parts will stick together, it would be nice to immediately provide for connections, for example, “dovetail”.
3dfilemarke is a growing 3D modeling community where you can browse community-promoted models in multiple categories. The site allows uploading as well as downloading models. Also, you can search for specific models directly.
Print me a sheep. Threeding.com
A marketplace for free and paid 3D models, Threeding.com provides you with printable models to help you with your school assignments or office projects. You can browse by category or search for models using keywords to find the model you need.
While the site is primarily a place to buy and sell 3D models of all kinds, not just 3D prints, CGTrader also offers a selection of free models that can be used for a 3D printer.
Youmagine has over 13,000 open source 3D images. You can View recent as well as featured designs or View models directly by category. Models are organized into Numerous collections for easy navigation.
In this collection of 3D printing objects, 3Dupndown hosts both free and paid 3D model kits. It has professional looking designs that are perfect for industrial as well as personal projects. especially for gifts to your kids and friends.
Description. 3D printer LUTUM 3: 3D printing with clay
This is a unique device from the Dutch company Vormvrij, known for its developments in the field of clay 3D printing. The LUTUM 3 3D printer is the latest model in the line of 3D printing devices for their production. Clay printing is a special trend in 3D technology that has already received its fans and critics. Many designers and sculptors value 3D printing with clay for its unusualness and soulfulness, despite the impossibility of making detailed objects.
The LUTUM 3 3D printer is ready to break all stereotypes and allay the fears of skeptics about clay printing. This model is optimized as much as possible for easy operation and quality results. In this version, the developers managed to solve the problems with which they faced the broach of their activities. It was found that most of the difficulties in operating the devices were related to the environment in which they were operated. In addition, the LUTUM 3 3D printer is equipped with improved functional elements.
Clay 3D printer LUTUM 3
3D printing area. 45x45x49 cm
Unique 3D printer for clay printing. Mechanics, electronics and moving parts are hidden inside the case to prevent clay from entering. It is possible to print with two types of materials and work with different types of clay. A great option for sculptors and designers!
When buying a 3D printer, we are obliged to conduct training in working with the device! We guarantee technical support during operation and highly qualified service.
Among the mass of device innovations, several main factors should be highlighted that have a particular impact on the operation of the device.
So what’s interesting ?
- 24 V system, moving parts and electronics hidden inside the supporting structures. The latter are made of high quality, in a rigid powder-coated case. This prevents clumps of clay from getting into the moving parts of the printer;
- An updated extruder that allows you to print even tough types of clay. There is a possibility of using different screws for each specific type of material with different viscosity;
- Possibility of two-color printing by using two cartridges with the material at the same time;
- The scope of delivery includes screws for various types of material;
- Plot area 45x45x49 cm along the XYZ axes.
- Original quality equipment from the manufacturer;
- Affordable prices;
- Delivery to all cities of Ukraine;
- A wide range of spare parts, consumables and accessories for 3D printing;
- Consultation and support when choosing equipment;
- Service and warranty service;
- Compulsory training in working with the purchased equipment.
For all questions, please contact us by phone or e-mail indicated in the section “Our contacts”. We look forward to collaborating!
3D Modeling Rules for 3D Printing
It is known that a prerequisite for 3D printing is the availability of a 3D model, according to which the printer will grow a 3D object. But, even having modeled an object, you should assume with absolute certainty that the job is done, and soon the printer will give you the finished product. The fact is that not all models are suitable for 3D printing. There are certain requirements for the dimensions, thickness and design of models. and these requirements vary depending on the material and printer used. In addition to THESE individual characteristics, there are general requirements that distinguish models for printing from other 3D models. And now we will tell you more about how to prepare a model for 3D printing.
First of all, you need to remember that STL files (for one-color models) and WRL (for color 3D printing from plaster) are suitable for 3D printing. Almost all 3D modeling programs allow you to export models to STL, so this shouldn’t be a problem. It should also be borne in mind that for online download on our website, files are accepted no more than 50 MB each, as well as an extended list of formats that are automatically exported to STL: STP, STEP, OFF, OBJ, PLY and STL directly. If the file size is more than 50 MB, then you need to send the model to our email address: support@cubicprints.Ru. By the way, one of the easiest ways to reduce model size and file size. The creation of hollow 3D models, in how it works, we already wrote in our blog.
Before you start creating a model for 3D printing, it is important to understand what material you want to print the product from. Each material has its own individual characteristics for 3D modeling. Maximum and minimum dimensions of the model, wall thicknesses, distance between moving parts, etc. You can learn more about the requirements for a particular material in the appropriate section on our website.
If you use the online model upload on our website, it will automatically check for standard 3D modeling errors. Models are checked instantly, and if errors preventing 3D printing were not found, then immediately after downloading the model will appear in your personal account in the “My Models” section. If the model has not passed the test, then you will see a notification about the impossibility of uploading the file, then you will need to check and modify the model again.
What are the most common mistakes encountered when modeling for 3D printing?
- Inverted normals. Incorrectly oriented normals. Normals should always be oriented outward, they define the boundaries of an object and allow the 3D printer software to understand where is the inner and where is the outer surface of the model. If at least one of the normals is directed in the opposite direction and contradicts another normal, then this will cause a failure in 3D printing, since the device cannot distinguish between the front and the wrong side of the object.
- Non-Manifold Geometry. Non-manifoldness of the 3D model is a prerequisite for 3D printing. The essence of this concept is that each edge of a 3D model must have exactly two faces.
This concept usually includes the following errors:
O Mesh with holes. The problem of an “open” mesh. Remember the basic rule of 3D modeling: your model must be “waterproof” or “airtight”. If a hole is formed, it means that one edge is missing in some edge, therefore the model is non-manifold, and therefore not suitable for 3D printing.
O Presence of internal polygons. Inside the model, for example, inside the walls, there must be no faces.
O Common ribs. The error occurs when more than two polygons are attached to one edge. Each edge in your 3D model should only join two adjacent faces.
O Concatenated edges. Occurs when two SEPARATE edges are created at the same location and are NOT connected, such edges Must be combined into one common edge.
O Polygon overlap. Formed when a polygon is created over an existing one. Intersecting edges can confuse the slicer. A program that converts a 3D model in layers into a control code for a 3D printer.
O Zero polygon thickness. To avoid this error Make sure that each polygon has the specified thickness.
How to fix common 3D modeling errors?
To do this, just use the Netfabb program, which with more than 95% probability will fix all errors. You can download Netfabb here or use the online version of the program.
Read about the basic principles of working with Netfabb in the “Lessons” section of our blog.