• 3D Printing
  • How to avoid deformation and bending of 3D printing

In this printing mode in which the plastic is hot melted and then extruded, different portions of the cooling process have different cooling rates (shrinkage ratios). Such effects can be deformed or even bent as the print mining department performs. Although PLA

Plastic has lower than ABS

The contraction, but both have the same deformation problem, and if it is serious, it may ruin a printed work. In fact, there are several ways to avoid and reduce such a shallow situation. The most important and effective way is to warm the bottom plate. However, this may not be enough. Here are 14 ways to improve this problem.

, using a heated base plate (heated print bed)


Heating the print bed helps the bottom of the original print to be at a temperature consistent with the top layer, which ensures that the cooling of the entire object is uniform. Heated print bed (Heated Build

Platform/HBP for short) is critical for the printing of ABS and PLA materials.


2, print a bottom pad (or 筏 raft)


Bottom pad raft (a derivative construct used to carry printed objects) is ReplicatorG and Skeinforge

An option in the software. Basically it is a larger area plane created specifically under the main printed object. Through a larger area of ​​attachment / grasping the construction surface of the machine, it can effectively reduce the degree of bending deformation of the object. Another way to spread is to produce a large, more generous raft

To surround most of the print layer (not just the bottom).


3. Calibrate the initial height of the Z-axis print


The quality of the first layer of construction is enough to affect the subsequent results. If the starting height of your machine's Z-axis is too high, heating the extruded plastic wire will not effectively adhere to the plate. It is recommended to test the machine with a minimum unit of 0.05mm adjustment, until the extruded plastic wire is too narrow between the nozzle and the platform, and it is forced to show a large area of ​​flattening, which can be regarded as a suitable bottom layer.


4. Use a pair of construction platforms


Some people try to build a platform with different materials, such as steel, titanium, glass, various plastics, various tapes, and foam boards. However, whether it is for ABS or PLA plastic, it is heated Kapton solder mask tape (Kapton)

Tape/PI) and 3M blue masking tape (commonly available on Taobao) have excellent adhesion.


5, keep the construction platform clean


A clean construction of the platform surface will make the ABS and PLA materials more adhesive. Please remove dust, leftover prints and debris from the work surface of the platform.


6, reduce the speed of printing


Slow printing will help to improve the fineness of the print, with better adhesion to previously printed parts or to the underlying surface that was originally created. At the same time, this allows the printed part to have ample time to make the cooling process more uniform.


7, reduce the printing temperature


Printing at lower temperatures is not an appropriate option. Ideally, printing should be performed at a temperature that allows the lowest temperature of the extruded plastic/and can be successfully attached. However, such an attempt is not suitable for people with heart failure. Printing at an excessively low temperature is highly likely to cause serious damage to the feed motor and extruder due to blockage of the nozzle.


8, exclude the wind, air flow or enclose the machine


Mr. Forrest Higgs found his 3D printer

Because it is too close to the window, the object is deformed due to uneven heating. It is the side close to the window that is deformed and curled. Since he did not intend to completely close the window, in order to compensate for the temperature difference caused by the wind, he installed a heat lamp to make up. Cupcake

Users of the Thing-O-Matic model can simply close two or three open faces while controlling the flow of smoke.


9, print mouse ears


Mouse Ears Tabs by Zach Smith

One idea that comes to mind. The use of circular small-area objects added to the corners helps these corners to be attached to the work surface. These things like mouse ears are similar to Raft

Function, but not a large area of ​​printed material


10, print the lining


Forrest

Another suggestion by Mr. Higgs is to use a device similar to a petticoat to be placed around the object. These low-profile, thick objects help to smooth the Raft base and avoid the effects of deformation or bending.


11, the surrounding hot wall design


Forrest

Mr. Higgs solved the problem of deformation by engineering logic to solve the lining. Mr. Nophead designed a hot wall for the machine. This thin wall allows the continuously moving nozzle device to maintain the temperature inside the machine. . He boldly assumed that only a thin wall surrounding the machine might have the same effect as placing the machine in a closed cabinet; interestingly, he suggested that if the corners were treated with multiple chamfers when designing the object, such a shape could Prevent bending of materials.


12, reduce the amount of filling


When constructing a 3D printed object, we can set the spray rate to be hollow, solid, or between 0% and 100%. However, as Nophead points out, the plastic inside the model creates a force that drives the deformation as the object cools. This explains that as you use more plastic, these plastics will pull the force during the cooling process against their own shape. Reducing the use of materials will greatly reduce the force inside the plastic while reducing the possibility of deformation and bending of the object.


13. Processing the surface of insulating tape with sandpaper


Charles Edward Pax suggested that the surface of the insulating tape should be fine-grained with sandpaper, which would increase the adhesion of the plastic and make it easier for the plastic to adhere to the heating platform.


14, directly generate an ABS surface as the bottom plate


Some people suggest applying a layer of liquid ABS directly to the heating platform before printing, which is similar to creating a large-area floor.