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3D printer FLSUN QQ-S Pro

The video about the FLSUN QQ-S Pro


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The printer ships with just a small spool of filament, so add spools of 1.75mm filament to your order.

About the printer

FLSUN QQ-S Pro 3D printer
Figure 1:
The FLSUN QQ-S Pro is a 3D printer with delta mechanics. It is obvious that the printer, due to its design, is quite high at 101cm including the filament spool, but with a triangular base of 46cm edge length it occupies not much space on your workbench.
The big advantage of the delta mechanism is that the print bed is not moved. Instead, only the relatively small mass of the print head is driven. The heavy print bed and the objects to be printed always remain in place. Since only a small mass has to be moved, the stepper motors can be controlled with high acceleration values.
Another advantage is that two or even all three motors work at the same time to move the print head in one direction, following the rule: "Together we are stronger".
More high resolution photos of the FLSUN QQ-S Pro are available as Download-Paket (44MB!).

Mechanics

FLSUN QQ-S Pro 3D printer, round bars
Figure 2:
At the edges of the frame there are two parallel rods with a diameter of 8mm. The rods are straight, the illusion of a bend in the photo is only created by the wide-angle lens of my camera.
The print head is driven via toothed belts.

FLSUN QQ-S Pro 3D printer, belt tension
Figure 3:
The belt tension can be conveniently adjusted on the pulleys at the top of the frame using knurled nuts. Once that's done, the mechanics run pretty smoothly.
The heavy stepper motor of the Bowden extruder is also located on top of the device and therefore does not have to be moved when printing.

FLSUN QQ-S Pro 3D printer, Extruder
Figure 4:
The extruder motor pushes the filament towards the hotend with a gear reduction of 3:1. I was able to print with the QQ-S Pro at up to 120mm/s with a layer thickness of 0.2mm and an extrusion width of 0.7mm without any trouble.

FLSUN QQ-S Pro 3D printer, brass bushings
Figure 5:
Brass bushings are used to guide the movement along the round rods. My personal opinion on this is: It's better to have good brass bushings (and the ones on the QQ-S are good) than bad linear ball bearings (I've had quite a few of them)!

FLSUN QQ-S Pro 3D printer, guides along the round bars
Figure 6:
The push rods are connected to the linear guides on the one...

FLSUN QQ-S Pro 3D printer, print head
Figure 7:
...and to the print head on the other ends. Two parallel push rods per edge are used to prevent the print head from twisting. The system is not completely free of backlash and torsion, but once more, keep the low price in mind.

FLSUN QQ-S Pro 3D printer, end switches
Figure 8:
In contrast to conventional printers, the limit switches of a Delta printer are located at the top of the frame. With that, the print head moves up if the homing process is triggered. All three stepper motors start rotating simultaneously and as soon as a limit switch is reached, only the motor in question is stopped until all three limit switches are finally reached.

Electronics

FLSUN QQ-S Pro 3D printer, interior of the base
Figure 9:
All components are neatly laid inside the base.
The power supply delivers an output voltage of 24V at up to 15A, which corresponds to an electrical output of 360W.
The three stepper motors moving the print head are also located in the socket.

FLSUN QQ-S Pro 3D printer, mainboard
Figure 10:
According to the printer menu, the mainboard identifies itself to be a MKS Robin Mini Board and the microprocessor type STM32F runs the Marlin firmware.
The stepper motor drivers are plugged into sockets and can therefore be quickly replaced if necessary - that's how I like it!

FLSUN QQ-S Pro 3D printer, Autolevel Sensor
Figure 11:
The QQ-S Pro has a sensor for auto-leveling the print bed. This is a mechanical switch, which must be attached to the print head via a magnet before starting the procedure. Furthermore, the cable must be connected to the socket on the print head.

FLSUN QQ-S Pro 3D printer, bed heating
Figure 12:
The coated glass plate is glued to the heated print bed, so it cannot be removed.
The print bed heating reaches the maximum temperature of 110C specified by the manufacturer after 10 minutes, whereby the ambient temperature at the time of the measurement was 16C.

Printer cover

FLSUN QQ-S Pro 3D printer, materials for frame cover
Figure 13:
The frame of the QQ-S Pro can be covered very easily, which significantly increases the ambient temperature inside.

FLSUN QQ-S Pro 3D printer, frame cover
Figure 14:
For a quick test, I cut three sheets of 2.5mm Plexiglas and mounted them on the frame with tape.
In my video studio, which is only around 14C cold, the temperature of the Plexiglas cover is between 30 and 40C at the outside. The wavelength, the infrared thermometer uses for measurement, cannot penetrate the Plexiglas.
The build space is warmed-up by the bed heater and to a very small extent by the hotend.
In addition to the triangular frame it is very advantageous that all electronic components of the delta printer are outside the heated chamber, including the stepper motors for driving the print head, which are located in the cold base. The QQ-S Pro does not really take up any more space on your workbench with the Plexiglas cover.

Sample prints

FLSUN QQ-S Pro sample print Benchy
Figure 15:
Benchy:
Material: PLA
Nozzle: 0.4mm
Layer height: 0.2mm
Dimensions:: 60x31x48mm
Definitely not the very best Benchy. The QQ-S does not deliver outstanding, but usable results. It is a fairly inexpensive device with a special mechanism and potential for improvement - a printer for tinkerers like me!
FLSUN QQ-S Pro sample print Benchy
Figure 16:
Benchy:
Material: PLA
Nozzle: 0.4mm
Layer height: 0.2mm
Dimensions:: 60x31x48mm

FLSUN QQ-S Pro sample print Benchy
Figure 17:
Benchy:
Material: PLA
Nozzle: 0.4mm
Layer height: 0.2mm
Dimensions:: 60x31x48mm

FLSUN QQ-S Pro sample print Benchy
Figure 18:
Klemme:
Material: PET-G
Nozzle: 0.4mm
Layer height: 0.2mm
Dimensions:: 90x26x10mm
The clamps are used to keep the limit switch wires away from the moving parts - an improvement that will surely pay dividends in the long term. The 3D file is available as download.
FLSUN QQ-S Pro sample print ABS without frame cover
Figure 19:
Schachtel:
Material: ABS
Nozzle: 0.4mm
Layer height: 0.2mm
Dimensions:: 100x50x50mm
If ABS is printed without a frame cover, the box begins to visibly detach from the print bed at a height of 10mm. A horizontal crack later formed, making the print completely unusable.
FLSUN QQ-S Pro sample print ABS with covered frame
Figure 20:
Schachtel:
Material: ABS
Nozzle: 0.4mm
Layer height: 0.2mm
Dimensions:: 100x50x50mm
Here the same box was printed with the cover. Only slight detachments can be seen at the corners, the print shows significantly less warping. Active heating of the build chamber to reach higher ambitient temperatures should improve the result even more.



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