Questions before buying a 3D printer

Questions / tests for the seller of the equipment:

1. Reliability of the seller – the most important !!!

Rankings in Google or Facebook can teach something, since I have heard about buying reviews (like a gift roll or a significant discount), we recommend listing on Google the name of the company (in the company Ltd.) or the name of the business owner (when it comes to an authorized dealer) and the word claims. Over 90% you will not find anything but it will get the clowns out of you and reduce risk. (True not only for 3D printers) However, there has never been a dispute that needs to be resolved in court even with the most difficult clients (over 2500 different clients have passed away).

2. Is there a warranty on the printer? What responsibility and by whom?

But you can get general information about what you get a self-assembly kit does not always include a warranty. You will light a red light in return as a full manufacturer’s warranty on all parts. The Chinese manufacturer is quite a warranty up to the door (passed the door over warranty), from the seller’s point of view it is legal to say such a sentence but it is immoral and there is no professional ethics here. If there is no production problem you have no responsibility.

3. Is the printer available?

Red light: Delivery within 45 business days = Dropshiping and at the same time listed in stock with V Sea delivery takes about 30 business days, obviously this is a deception.

4. Is it possible to get instruction on the printer?

majority Prospects We will get extra charge separately the tutorial on the printer but If there is no option for instruction it is quite a light red light. It is important not to fall for a business that sells other equipment and has no idea about 3D printing, because the truth is that it is not a two-dimensional printer that only clicks Print, there is a lot of depth.

5. Find out that the details match the site – warranty price, etc .:

Until you checked you can not know. If I had not personally heard a case from a trusted person, I probably would not have believed it existed. Price on the website is cheap for a 3D printer (and charging in a higher operation) and an attempt to get the seller of the equipment without success (until you call from another number and only then make a cancellation).

6. Question to the seller: I have no experience in 3D printing. Is it easy to print? (Even if you have experience).

Red light: Very easy at the push of a button. The usual answers – there are free tutorials on Youtube, you can order a tutorial for an additional fee or require an initial investment of time, etc. It is important for me to note that I do not think most equipment sellers are like that, there are good ones and there are clowns The purpose of this article is to flood the “shit” and give you better tools to understand what you are facing before purchasing. The good ones have more and less and the clowns have more and less, each field has different levels of service providers.  

Questions for yourself:

1. What type of print do I want to print on the printer?

There is a clear distinction between an industrial product with a relatively high quality finish and household products. For industrial products, ABS or a more durable material is most often used because it is a material that allows high-end results to be achieved easily (in a closed printer). If I have an importance for a very high level of finish it may be that printing with DLP or MSLA technology is preferable (liquid printing). On the other hand, for printing household products that do not require a very high finish, PLA plastic, which is characterized by an easier ability to work, does not require special properties. In addition, the PLA material is more “forgiving” in cases of slight differences in temperature and ease of printing.

2. What is the printing space that meets my needs

Printers are offered with different and varied printing areas, the areas that “shelf” printers have are from 100x100x100 mm to 500x500x500 mm Please note, too small an area will be very challenging and limit the possibilities. Too large an area will not be effective for 3D because the printing time will be very long (unless you increase the diameter of the nozzle that hits exactly).

3. What are the types of materials I would like to print

A printer without a bottom heater allows printing in 2 types of materials called PLA and TPU (flexible material) when the TPU requires a temperature of about 220 degrees (when there is no bottom heater). Most of the most basic printers have the ability to print with these 2 types of materials. For TPU, an extruder is required with a small space between the feeder gear and the input of the material if it is not usually possible to print an adapter. ABS – a material that allows for a high level of finish, usually requires a temperature of 225 degrees and 100 degrees in the lower heating element. PC-polycarbonate which is a very strong and hard material but requires very high temperatures of 260-280 degrees and 120-130 degrees in a lower heating element. PVA- Printing result is not impressive in general but the material has a special property that it dissolves in water, take this into account in your design. For example, if I have a double head (with input of 2 materials) you can make the supports for the part with PVA and the rest of the printing with regular material (PLA or ABS) and at the end of printing put the part in an ultrasonic chamber with light heating and thus remains with a product with excellent finish , As opposed to cutting with a Japanese knife / scraper and rubbing with sandpaper of the supports that usually leave marks.

3. What is the print speed

Print speed is determined by the nozzle diameter, the printer is offered with a diameter of 0.4 mm, a small diameter such as 0.2 mm will significantly improve the accuracy in the small details but will extend the printing time up to almost 4 times. A diameter of 0.8mm will do the exact opposite operation, more speed, but no doubt we will see the connecting stripes of the print between layers.

4. What number of colors and heads is required

It is important to understand the difference between a double head and the number of color feeds! There are a number of disadvantages to a double head:
  • Loss of work space (due to the distances between the nozzles)
  • A height difference on the Z axis will make coping very difficult
  • A slight deviation in the X-axis or Y-axis will also make printing very difficult
  • Receiving a phenomenon called ooze shield which will require the construction of a different program with the implementation of Shield for the entire product, see image to describe and explain this problem

Dual head benefits:

  • Ability to use several types of materials
  • Faster than other methods for using multiple colors
Regarding the number of colors, first make sure that the control panel does support the number of colors and the additional costs should not be taken into account.

The disadvantages of a head with 3 colors:

  • 3 heating elements and 3 feed motors – higher failure potential
  • Replacement time delays print time

Pros:

  • Several colors can be used
  • You can also use color mixing for example feeding 50% yellow and 50% of blue form green so that once there are several colors you can get a very wide range of colors.
Of course, it is also possible to use a single head and a single feed for several colors, but this ability is quite limited. In the above example there were about 2 stops in favor of replacing the supply wire, i.e. it requires a printing stop at each color change. Replacements can only be made at a different height on the Z axis so it is not possible to change the color on the same line.    
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