5-11/2019 Sunlu PETG Black

An online seller decided he wanted to give me an opportunity to test and review Sunlu PETG. A link to his American store can be found here and to his European site here.

NOTE: I talked to the provider of this material and asked to provide some different colors in the future. The reason is that the black is hard to photograph and in the results, it makes details more difficult to see.

The brand Sunlu, has a nice site of its own, where you can see their products and some additional information.

This review handles black PETG. Some base info: nozzle temperature: 230-250°C, bed temperature: 80-120°C, fabrication tolerance: 0.02 mm. The value of this last parameter is only the second manufacturer I’ve seen until now, who works so precise. The filament can be provided in 1.75 mm and 3.00 mm. There is 1 kg of material on the spool, 395 meters when 1.75mm, or 135 meters when 3.00 mm.

Packaging:

A brown (boring, but this is not affecting the print quality) box with black printings, a sticker on the side that tells you what the content is, and some general settings for printers on the back.

The spool is very neatly packed in a vacuum sealed back, which included some silicate for keeping everything dry. One thing I miss is that there are no markings on the side of the spool, which can give you an idea for estimating the rest of the length of filament on the spool. You can go for a wild guess with the big openings in the spool, but that will be less precise. The windings on the spool are 1st class. The deviation (tolerance) was never over the 0.02 mm they had promessed (measured on 10 points over a 5 meter distance).

First test is always a temperature tower. I’ve started from my standard PETG profile, 0.2 mm layers and 80°C on the bed. The result looked the best around 225°C. (Later I adjusted to even 220°C, to get better overhangs, and did this in combination with adjusted cooling).

Test: calibration cube. 0.2 mm layers, NO supports and 5% infill. The result was very promessing. Almost no stringing. Tight lines, even the details on the top where pretty ok (which are usually not). The edges on the inner holes where sharp. A good finish on the bottom side, where I could print nearly horizontal without the supports (middle in the cube). Absolutely no warping.

top
side
bottom

The next test is as usual: an owl, 0.15mm layers, no supports. Again we get a superb result.

TIP: the really fine stringing here, can easaly being removed by using a hot airgun.

Since the standard testing was done, time to do some more exotic stuff. Thisone was tested in the period of Halloween. All prints where done on 0.15 mm layers. The first print was done on 230°C. Adhesion of the layers, the result of the print, everything was perfect,……. except for the parts using supports and/or overhangs. From here on I adjusted cooling and nozzle temp and everything went fine. (pic2: the bottom 1 cm had clearly an issue with overhangs)

Time for a big version. Temperature of the nozzle and cooling where adjusted and you can clearly see the improvement of the result.

You’ll notice the supports in the front of theface in this pic.


Currently, I have some projects for myself still running. So why not print some parts for that? These train wheels are printed on 0.15mm. The diameter of a wheel is about 10 cm.

Some parts for the robot I’m building should be printed too. Perfect material, since the chassis of the robot is excisting out of black PETG.

I still had some leftover on the spool, but not enough to be used for the rest of my projects. So, what about something different? The hand of Jaime Lannister (Game of Thrones). 0.15 mm layers, 220°C, NO infill, 3 perimeters. Only 1 spot had supports (pic 2), since they where really needed there.

Ther first 4 pics show the result still attached to the steel spring sheet. Just to illustrate there where supports in only 1 spot.

I was blown away by the result! Thisone I’m going to take one step further. “PEOPLE” say that PETG is almost not paintable. I will try this out. First a primer, then a golden look.

Conclusion:

  • Packaging is ok: the spool is dry (silicate) stored in a vacuum sealed bag. Boring box, but this is not affecting printing.
  • Just as with Sunlu PLA: I miss markings on the spool to determine how much filament is left on the spool.
  • Nozzle temperature:That I’ve reconcidered and lowered to 220°C to improve stringing and overhangs. This is below the proposed 230°C Sunlu suggests.
  • Stringing: very minimal, once you have the correct temperature.
  • Bridging, supports, overhangs: I had an initial problem with the quality, but once I’ve fixed temp and cooling, the results became perfect.
  • Warping: Usually PETG is not really sensitive for warping. In general, the material even sticks “too good” to the bed. I use 3D-Lac as a film between bed and print. This helps afterwards to make the print release from the bed.

People that are looking for some good PETG, I only can encourage them to use this Sunlu material.

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