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3D Printing

4 Posts authored by: wenganxiang

Did you know that some of your 3D prints may have partially or completely failed just because of humidity contained in the filament you used? This sort of humidity is invisible to the naked eye, so you probably blamed your print settings, your 3D printer or even doubted your abilities, but all of that may actually not have been the cause of your problem: it was the humid filament.QQ截图20150317103127.png

As we already briefly explained in this article, nylons will saturate with water (i.e. absorb its maximal capacity in water molecules) in only 18 hours being exposed to ambient air. The situation is even worse with specialty filament like PVA (more about PVA in our materials primer post) which is used to create support structures, which are easily dissolved by putting your print in water. PVA is extremely hygroscopic and needs to be stored in a sealed box or a special container. Otherwise, it will attract so much water from the air that it will render it useless. But not only nylons or PVA are concerned, PLA and ABS also attract water from the air, even if it is to a lesser degree.


Just get yourself some vacuum bags. Please do pay attention to only buy the type of bags fitted with a vacuum valve, which permit all air to be vacuumed out with a standard household vacuum cleaner. These vacuum bags are normally intended for storing clothes, linen and such in a place-efficient manner. They normally also provide protection against water, odors, mildew, dust and pests.


The idea behind using those bags is to store your filament spools in an air-free environment (vacuum), so that they cannot absorb any more moisture from the ambient air. As the vacuum in the bag is not absolute, you need a solution to absorb any possible remaining moisture. We recommend to simply add to your bag some silicagel beads, which are very effective moisture absorbents. You can choose to either buy a number of ready-to-use silicagel packs (a.k.a. dry packs), which can be re-used if you dry them in an oven. However, their biggest disadvantage is that you have no way of knowing when the beads are saturated with water, as the (Tyvek) bags they come in are opaque/non-transparent. It is also sometimes difficult to buy them in small numbers at an acceptable price.


More details:

Get filaments:

Hi, everyone. This passage is mainly written for  those who uses 3D printer for the first time.

I want to share some printing results with different slicer settings. Hope this will help some of you.


Printer: Geeetech Acrylic Prusa i3

Filament:  PLA 1.75mm (also fits for 1.75mm ABS)

Nozzle diameter: 0.3mm


1. Infill density

     15% vs 30%


                15%                                                                                                                                                   30%

            As you can see in the picture, there are still many holes unfilled with 15% infill density. But the model is full filled with 30% infill density.


2. Skirt loops

      0 vs 3


            Obvious difference as you can see in the pictures above. Personally, I suggust you'd best print at least 3 loops of skirt, because the filament may not come out from the nozzle immediately.


3. Brim width

     0 vs 1


     If the brim width is 0, printer will print 100% as same as the stl file. if the brim width is 1, printer will printer another brim, as you can see in  the right side of picture.


4. Extrusion of first layer

    100% vs 200% vs 400%

QQ截图20150311155336.png QQ截图20150311155404.png QQ截图20150311155412.png

      In my opinion, the precision of model will decrease as the extrusion width increased.


5. Vertical shells:perimeters(minimum)

     2 vs 4


   Look at the edge of these 2 models. If perimeter is 2, there are 2 loops of brim on each layer, and the model has a better look.


If you think there's something worth sharing,  I will be glad if you leave your advice. 


3D printing puzzle

Posted by wenganxiang Mar 3, 2015

I download  stl files of puzzle of China and use my Geeetech 3D printer to print them. Here are the pictures. I could have printed a lager one, but I wanted to look how accurate the printer is first. Looks great! for me, it's accurate enough for a printer costs $299. Next time I will print a colorful one! What's your opinion?



In case of accident, I asked for  the stl files of printer parts from the Geeetech service. Then I printed them. A

Not badly, Geeetech 3D printers performance on printing these models!  It may save me lots of time on replacing with a new one if a part is broken.

Actually, I really hope all the parts I printed will not be used forever.




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