Ortur Obsidian Review: Feature Packed 3D Printer

I noticed the Ortur Obsidian while browsing Gearbest, and it looked like a featured packed 3D printer available for a fair price. I thought it would be a good printer to test and check if it’s a good competitor for the popular Artillery Genius. Continue reading to learn more about the Ortur Obsidian and find out if it lives up to the expectations.

Ortur Obsidian Shipping and Packaging

The Ortur Obsidian comes in a carboard box with ample protection on all sides. Everything is packet well in plastic bags for extra protection. I don’t think there’s any risk of receiving the printer in good condition even if it gets a bit roughed up during shipping.


Assembly of the Ortur Obsidian

In the Ortur Obsidian description, it’s stated that the assembly takes about 20 minutes, but this is an optimistic estimate. It took me about 1 hour to properly assemble the printer and check everything, mostly because the assembly guide steps are not accurately described in the correct order.

On the included SD card, there are a few helpful videos for assembling the printer but even in these videos, some of the steps are not followed in the correct order.

I recommend you check all the screws to make sure everything is nice and tight because I found some loose screws. Besides that, I also recommend you check the eccentric nuts for all the roller wheels and tighten them just right. They should be tight enough so they can barely be turned with your fingers, but not too tight so they develop flat spots.

Finally, take extra care when assembling the printer to make sure the frame is square. All these steps are required for any printer to ensure good results during printing. It’s always good to take your time during assembly, to avoid issues which can be more time consuming later.

Besides the printer parts, you also get the following accessories:

Ortur Obsidian accessories
  • Tools for assembling the printer
  • Card reader with 8GB MicroSD card
  • Leveling blocks
  • 200gr white PLA roll
  • Power cable
  • Plastic handle
  • Top mounts for Z screws
  • Screws for assembling the printer
  • Z-sync belt
  • Zip ties
  • PTFE tube for reverse bowden
  • Rubber feet
  • Z endstop
  • Pulleys for the Z sync belt

Ortur Obsidian Specs

Brand Ortur
Model Obsidian
Type DIY
Material (Frames) Aluminium Extrusion,Sheet-metal structure
Platform board Aluminum Alloy
Nozzle diameter 0.4mm
Nozzle temperature 0 to 260 degree
Product forming size 250mm * 250mm * 300mm
Layer thickness 0.05-0.4mm
Memory card offline print SD card
LCD Screen Yes
Print speed 150mm/s (MAX)
Platform temperature 0 to 120 degree
Supporting material ABS,HIPS,Nylon,PETG,PLA,TPU
Material diameter 1.75mm
Language English,French,German,Russian,Spanish
File format G-code,STL
Model supporting function Yes
XY-axis positioning accuracy 0.11 mm
Z-axis positioning accuracy 0.04mm
Voltage 110V/220V
Print Surface Sticker
Host computer software Cura,Repetier-Host,Simplify3D
Packing Type Partially-Assembled packing
System support Windows, Linux, Mac OS
Voltage Range AC110V/220V
Current 24V, 15A
Connector Type SD card,USB

250x250x300 build volume

The Ortur Obsidian 3D printer sits between the regular and large format 3D printers. It has a build volume of 250x250x300 in a compact footprint close to the one taken by the Artillery Genius which has a build volume of 220x220x250.

I really like this because it offers the best of both worlds. Larger print volume with smaller footprint, that doesn’t take a lot of space.

Ortur Obsidian vs Artillery Genius

Dual-Z axis with Z sync belt

Lately, more and more 3D printers offer Dual-Z axis and the Ortur Obsidian maintains the trend. With a Dual-Z axis setup, the X gantry can be moved easily and more consistently compared to a single axis printer. Both motors are wired to a single stepper driver. This works well, but you won’t be able to use features like the Z Steppers Auto-Alignment available in Marlin.

Ortur Obsidian Z Sync Belt

Considering that the stepper motors are linked with a Z sync belt, this is not that big of an issue and can easily be ignored. Unfortunately, my Z sync belt seems to be a bit longer than it should, and doesn’t sit properly on the pulleys. It could be an isolated issue, but it’s worth mentioning.

POM anti-backlash couplers

Another excellent feature which works great with the Dual Z axis setup is the inclusion of POM anti-backlash couplers. The Ortur Obsidian doesn’t use the regular Z screw nuts like most of the printers, but instead it has a pair of POM couplers which are used more commonly on CNC machines.

Ortur Obsidian POM Nut

BMG Direct Drive Extruder with reverse bowden

The Ortur Obsidian also includes a BMG Direct Drive extruder clone with a 3:1 gear ratio. It’s not the best quality BMG clone but it works well and gets the job, accurately extruding filament.

Currently, the BMG is my favorite extruder and I’m happy to see this included out of the box with the Ortur Obsidian.
On the right side of the motor, there’s also a handy metal knob which is used when feeding new filament which makes filament replacements a breeze.

To make things even better, the Ortur Obsidian uses a reverse bowden setup to route the filament from the spool located in the back of the printer, to the hotend. That way, there is no weight added to the top of the printer.

It’s the first 3D printer I tested which uses this setup, and I love it. It makes the whole setup look cleaner.

PTFE lined V6 clone hotend

The BMG Direct drive extruder is paired with a V6 hotend clone. The heat break is lined with a PTFE tube which goes right up to the nozzle, thus limiting the temperature you can print reliably. With this setup, the hotend is capable of safely working up to 240C without damaging the PTFE tube and I don’t really recommend going past this temperature for long periods of time.

Ortur Obsidian V6 hotend

If needed, you could easily upgrade the heat-break with a Bi-metal heat break from Trianglelab or a Copperhead heat break from Slice Engineering which will offer much better thermal performance and will allow you to reach higher temperatures safely. Even with the stock setup, you can print PLA, PETG, and TPU with no issues.

Next to the hotend there’s also a white LED light which should light up your print, but it’s blocked by the bottom metal cover of the extruder.

Inductive Auto Bed Leveling probe

To make things easier for beginners and advanced users alike, the Ortur Obsidian also includes an inductive auto bed leveling probe. This is similar to the popular BLTouch ABL probe but it only detects metallic surfaces so it will only work with the stock bed or with a PEI Spring Steel Sheet. The heatbed is probed in 25 points and I had no issues with it during my testing. It’s reliable and produces consistent measurements.

Inductive ABL Probe on Ortur Obsidian

When you receive the printer, I recommend you make sure the probe is set at the correct distance from the bed. In my case, the probe was sitting a lot higher and it would not detect the bed.

The probe can detect metallic surfaces from about 4mm, so I recommend you install at ~2-3mm above the bed. The easiest way to do it is to manually lower the nozzle to barely touch the heatbed then lower the probe until the red LED from the probe light up.

32-bit board with TMC2208 silent steper drivers

The Ortur Obsidian comes with a proprietary Ortur 6.1 32-bit board with TMC2208 silent stepper drivers. As I previously mentioned, it only includes four stepper drivers which are soldered to the board, so there’s no way to upgrade it in the future.

Ortur Obsidian 32 bit Board

There’s also an ESP-01S slot where you can install a Wi-Fi module if you want, but usually the functionality of these adapters is not that great. The transfer speed is limited, so if you are looking to add Wi-Fi capabilities to your printer, then an Octoprint server would be better.

Unfortunately, the Ortur Obsidian board does not have heatsinks on the stepper drivers. Even tough there’s a fan blowing cool air over the board, I had a layer shift during a 20 hour print. This is caused by the overheating of the stepper drivers and it’s unfortunate. The heatsinks can help the drivers stay cool and avoid issues during printing.

Heatsinks can be purchased for about 3$, and the board cooling can be improved but hopefully Ortur will start adding heatsinks to the board in the future.

Responsive touchscreen

The touchscreen installed on the Ortur Obsidian is nice and responsive. It uses a proprietary interface which is a bit different compared to other 3D printers.

I like that there’s a speed indicator updating in real time during printing, where you can see the movement speeds on various parts of the print.

I don’t really like the small buttons and the way they are laid out on the screen. The XYZ homing buttons are sometimes hard to accurately touch with your fingers and there’s no home button to move all the axis to 0.

Marlin RTOS 2.1.6 firmware

The Ortur Obsidian is running Marlin with the addition of freeRTOS. I’m not sure if this version of Marlin brings any substantial improvements over the regular Marlin Firmware but this is what we get with this printer. There are no sources available right now for me to check.

Marlin RTOS

I will contact Ortur and update the review after I get more information about this.

Ribbon cables

You have probably seen the same kind of ribbon cables with the popular Artillery Genius and Sidewinder X1 printers. I think the Ortur Obsidian uses the ribbon cables a bit better, because there are ribbon cable strain relief brackets included which will make them more reliable.

Hopefully, more printers will use the same ribbon cables in the future because ribbon cables make the printer look much cleaner.

Belt tensioners on X and Y axis

You can tension the X and Y axis belts using the included metal belt tensioners. It’s nice to see these tensioners included out of the box because it makes tightening the belts easy.

What I don’t like is the missing spacers to keep the idlers centered. This is not a big issue and the printer works well but if the belt is not properly aligned, issues can occur during printing.

Auto Power Off with integrated relay

The inclusion of a power relay on the Ortur Obsidian is a nice upgrade over other printers available right now on the market. When the print is complete, the printer waits for the hotend to cool down then it turns off the printer
It’s the first printer I tested with this upgrade and I love it.

Ortur Obsidian Power Relay

You can add the M81 command to your end G-code which will turn off the printer. If the printer is connected via USB to Octoprint, the screen will stay on, but you can fix this with a simple cable mod: Fix Octoprint always on printer display.

Quiet operation

All the fans installed on the printer are relatively quiet. During printing, most of the noise comes from the 5015 part cooling fan blowing at 100%. The PSU and case fans are quiet, but still audible.

Ortur Obsidian drawbacks

No heatbed insulation

I would have liked to see some heatbed insulation material under the bed because it makes heating up a bit faster, and the the power consumption would be a bit lower during operation. They probably did this to make sure the bed cools faster and users don’t damage the surface when removing a print.

Fortunately, It’s a cheap and easy to do upgrade.

No removable print surface

Another feature which would have made this printer a bit better would be the addition of a removable bed surface. I’m not a fan of the included “glass sticker” and I will probably replace it soon with a magnetic PEI Spring Steel Sheet.

While the prints stick really well on this surface, removing them is hard. The prints don’t pop off by themselves like when using a simple glass bed and you need to use a sharp scraper or blade to remove them. Besides that, my print surface already has marks from the few prints I did during my time with the printer even tough the first layer was properly tuned.

Ortur Obsidian print surface damage

Keep in mind that it’s not recommended to print ABS on the stock build surface (probably because the ABS would fuse with the bed and removing it would be impossible).

Heatbed info Ortur Obsidian

The PEI sheet upgrade will be a bit harder to do because the 250×250 PEI sheets are not that common, so you would have to get one cut on order. Besides the size issue, removing the old sticker and cleaning up the adhesive could be hard to do, but I will update this article when I perform the upgrade.

Side mounted power connector

I don’t really understand why Ortur installed the power connector on the side of the printer when there’s ample space available in the back. You could mitigate this issue with an angled power cable but I would have still liked to have the power connector on the back.

Ortur Obsidian Power Socket

Bad quality printed parts

The printer also has some printed parts used in the construction of the printer. They don’t look that great but they get the job done. Fortunately, all the files are available on the SD card so you can easily re-print them if you are looking to make the printer look better.

This is not such a big issue, but I thought it’s worth mentioning, just so you know what to expect.

IdeaMaker profiles for Ortur Obsidian

During my time with the printer, I also tuned three IdeaMaker profiles for the Ortur Obsidian. These profiles are tuned for the stock printer and worked well for me. If you are looking to give them a go, then feel free to download them from the links below:

Ortur Obsidian IdeaMaker Profile – PLA – 3DPrintBeginner
Ortur Obsidian IdeaMaker Profile – PETG – 3DPrintBeginner
Ortur Obsidian IdeaMaker Profile – TPU – 3DPrintBeginner

Test prints on Ortur Obsidian

3D Benchy

As usual, we start the tests with a 3D Benchy. The quality is pretty good, considering this is out of the boxwith no tweaks made to the printer profile. A bit of over-extrusion which was easily compensated for with the flow calibration.

  • Material: SUNLU Gray PLA
  • Layer Height: 0.2 mm
  • Nozzle Temperature: 205C
  • Bed Temperature: 60C
  • Print Speed: 50 mm/s

Calibration Cube

After calibrating the flow rate, the calibration cube looks good and the extrusion is accurate. Unfortunately, the bridging settings were messed up and there are a few issues with the cube. But I was confident enough to start a bigger print.

  • Material: SUNLU Gray PLA
  • Layer Height: 0.2 mm
  • Nozzle Temperature: 205C
  • Bed Temperature: 60C
  • Print Speed: 50 mm/s

Gizmo

The first bigger model which I printed was Gizmo from Thingiverse. Layers are consistent even though it was printed at a higher speed than my regular settings.

  • Material: SUNLU Marble PLA
  • Layer Height: 0.15mm
  • Nozzle Temperature: 210C
  • Bed Temperature: 60C
  • Print Speed: 60 mm/s

Doctor Doom

Doctor Doom bust from Eastman was printed in around 24 hours. While the carbon filament can make the prints look better, there’s no denying that the print quality is excellent, and the Ortur Obsidian can deliver on its promises.

  • Material: SUNLU Carbon Fiber PLA
  • Layer Height: 0.15mm
  • Nozzle Temperature: 210C
  • Bed Temperature: 60C
  • Print Speed: 50 mm/s

Supergirl

The second bust is Supergirl from Eastman. This time, there was a small layer shift on the Y axis which I believe was caused by the lack of heatsinks on the stepper drivers. Anyway, the print quality is just as good.

TMNT

I also wanted to test the print quality using silk filament, so I printed the TMNT bust from Eastman. With this print, you can see the layer lines a bit more, and there are also some parts where cooling was not doing the best. But the print still looks really well in my opinion.

  • Material: SUNLU Silk Copper PLA
  • Layer Height: 0.15mm
  • Nozzle Temperature: 210C
  • Bed Temperature: 60C
  • Print Speed: 45 mm/s

Dory

PETG also print well on the Ortur Obsidian. The print quality is good, but if you look closely some small inconsistent layers can be seen. This could be caused by the old filament I used (opened about 12 months ago). I think that with a bit more tuning, you can get better quality from PETG.
I’m also happy to report that adhesion was great and there was no need for glue stick or other adhesion helpers.

  • Material: Fiberlogy Easy PETG
  • Layer Height: 0.2mm
  • Nozzle Temperature: 240C
  • Bed Temperature: 70C
  • Print Speed: 50 mm/s

TPU 3D Benchy

To also test the TPU performance, I printed another 3D Benchy because it it a pretty challenging print in TPU. The quality is fine, but as you can see, there’s some small stringing which most of the time is hard to get rid of. Maybe with a bit more retraction and coasting this can be improved (or even drying the filament in advance).

  • Material: Devil Design Pink TPU
  • Layer Height: 0.2mm
  • Nozzle Temperature: 215C
  • Bed Temperature: 50C
  • Print Speed: 40 mm/s

Conclusions: Is the Ortur Obsidian worth it?

The Ortur Obsidian looked like a promising printer, and I’m happy to report that it confirmed my expectations. It manages to produce quality prints consistently and there was no need for me to do any calibration for these results (besides the regular flow rate calibration).

It comes with some of the best hardware specs available right now in a compact package. All of these features are sold for a good price and I have no problem recommending the Ortur Obsidian considering the price range and the build volume offered.

Sure, it has some small drawbacks which can be fixed with upgrades further down the line, but out of the box, the printer is good enough to be worthy of your consideration.

The Ortur Obsidian is an excellent alternative to the popular Artillery Genius, offering more features with up to date hardware and a larger build volume. I would recommend getting it instead of the Genius even tough it’s a bit more expensive.

Where to buy the Ortur Obsidian?

The Ortur Obsidian can be purchased from the following sites:

Gearbest

Questions and Support

If you have questions about the printer, or you are looking to get support, feel free to join the 3DPrintBeginner Discord server or leave a comment. I would love to hear your thoughts about this printer.

The Ortur Obsidian was provided by Ortur for the purpose of this review. While the article includes affiliate links, all opinions are my own.

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