GUCOCO A8 DIY Printer Assembly

So now I’m the proud owner of a 3D Printer. To be specific, its a GUCOCO A8 Prusa i3 DIY 3D Printer and according to the the Amazon listing it looks like this:

On delivery, however, it looks like this:

Still, it did say DIY on the tin, and I enjoy a bit of a challenge, so I’m hoping this will be fun. I’m sure it will be, as the instructions are in Chinglish.

Before we go any further, please note: I am not an engineer, technician, 3d printing expert, experienced kit builder (well, apart from model railway building kits), or in any way a competant person.

I did once build a 2D plotter from scratch, but that was nearly 30 years ago, back when I was young, clever, optimistic, and able to see properly.

Firstly, go and find/buy a small amount of Blu-Tac (or smilar). You will find it useful for temporarily holding the M3 nuts in place in the various frames while the screws go in. Later you might want to use Milliput to secure the nuts in place., as they do tend to rotate if over tightened.

Step 1 A1 Main Frame Installation

Parts (as it doesn’t relist them in each stage – we are not in Ikea territory here):

  • 3 – M3 Washer
  • 4 – M3 Nut
  • 6 – M£x16mm Screw
  • A1 – XZ Frame
  • A2 – Left Side Frame
  • A3 – Right Side Frame

There are 6 screw/washer/bolt sets to put in, and their locations are fairly obvious.

The photos in the manual are ok, and there are no major pitfalls, apart from over tightening. Don’t worry if it looks like the frame is slightly on the wonk, as it will straighten up later.

Step 2 A2 Main Frame Installation


  • 5 – M3x8mm Screw
  • 21 – Dupont Cable
  • 23 – Power Supply

What isn’t clearly shown is that the PSU should be mounted OUTSIDE the frame. And you’d best check that the 110/220v switch is set to the correct voltage. Get it wrong and there will be a loud bang, and possibly a fire. It annoys me that the frame has a swirly cut-out that suggests a fan output, yet the PSU has a blank flat face adjoining it. And no, I didn’t put the PSU on backwards.

Don’t connect the mains power cable yet, as it will just get in the way.

Step 3 A3 Module Installation

  • 28 – Control Board
  • 5 – M3x8mm Screw (4)
  • 9 – Fan Column Support (4)

These go in the bottom 4 holes on the Left plate. With the PCU facing OUTWARD and the right way up!

Step 4 Wire Connection

  • 21 – Dupont Cable (again).

It goes off the rails here and goes on about parts used in the next few steps.

In English… Take the power cable from the PSU and connect it to the Red circuit board. Remember Red is Positive and Black is Negative. But if I have to remind you of that, then you should have given up just before the ordering stage. It also suggests connecting the mains cable (again), but it just gets in the way.

Step 5 Assembly of P Module

  • 6 – M3x16mm Screw (6)
  • 4 – M3 Nut (6)
  • 3 – M3 Washer (6)
  • 22 – Short motor cable Y
  • P Module

This is an arse-pain.  As this is a vital step, you can’t just mung it and hope for the best.  You WILL end up hanging the frame off your knees and swearing at the cat in a whole new variety of permutations of curse words if you get the wooden grommits on the wrong side of the frame. And you’ll need an M3 spanner or some pliers to help tighten the nuts on the wooden grommits. Only after that ordeal can you look at plugging the wires in. Oh boy.

Aside from the Blue wires, it doesn’t really explain which is which.  Which is nice.  So here we go…

So after this step:

Step 6 Assembly of A4 Module

  • 6 M3x16mm Screw (3)
  • 4 M3 Nut (3)
  • 3 M3 Washer (3)
  • 22 Short motor cable Z1
  • A4 module

Straight forward, but fiddly. On mine, the Z-axis limit switch was not bolted on, so I had to fix that.

By now the board should look like this:

Steps 7 and 8 are messed up

Steps 7 and 8 have the same instructions, so I did this instead.

Step 7 LED Display Assembly Method

  • 6 M3x16mm Screw (3)
  • 4 M3 Nut (3)
  • 3 M3 Washer (3)
  • 13 LED Module Cable
  • LED Module

No real issues here, so…

Step 8 Assembly of A5 Module

Basically, you’ll need to fit the A5 motor to the Right side of the fram, much like the A4 motor. This one doesn’t have the Z-axis switch though…

  • 6 M3x16mm Screw (3)
  • 4 M3 Nut (3)
  • 3 M3 Washer (3)
  • 22 Short motor cable Z2
  • A5 module

See photo:

And the circuit board now:

Now we should be back on track

Step 9 Q Module Assembly Method

  • 2 Threaded rods (2)
  • A4 Left and Right top plates
  • 6 M3x16mm screw (4)
  • 4 M3 nut (4)
  • 3 M3 washer (4)
  • 1 Smooth rods (2)
  • 22 motor cable (X)
  • Q Module

Oh deary deary me.

Take the Q module and stick the smooth rods through the outside holes. Then thread the threaded rods through  the threaded holes.  About half way for now. Then line up the L&R top plates with the rods and bolt them in. The motor should be on the Left side hanging backwards on the frame.


“Adjust the distance between the left and right bearing of Q module, and move the screw locking ring NO8 to the connected area of screw rod NO8 and A4 plate and fix the scre locking ring.”

I have no idea what this is refering to and there were no parts.  This bothers me.

“Align and insert the the flexible coupling M5 and A4 module with extrude side of the motor on A5 module. As ashown in picture 25, adjust the difference between left and right side of Q module. to prepare for the next correct assembled. Adjust the outer fringe’s horizon distance or both screw rod NO2 at nearly 320mm which is described as picture 27. The fastenin screws of the coupling of the fixed motor above are shown as picture 26.”


So picture 25 (and 26):

Pic 27:

I measured the distance and it was “nearly 320mm”. And I think it means “push the flexible couplings onto the motor stubs as far as you can and then carefully and tighten them up then make them level”.

Then connect the red cable to the circuit board and use the short motor cable (X) to plug in to the board.

So now the board looks like this:

Step 10 Print Head Assembly Method

  • 6 M3x16mm screw (2)
  • 3 M3 washer (2)
  • 4 M3 nut (2)
  • Print head (L1 L2 L3)

Ok, so… Unbolt the 2 long bolts through the cooling fan, and the assembly will come apart.

There are 3 bits:

L1 (The bracket, and extruder)

L2 (motor unit)

L3 (heatsink and cooling fan)

So now take the L1 unit and bolt it to the cross-peice of the Q Module. Of course the instructions don’t say which of the mounting holes to bolt into, but from the photo provided it looks like the bottom ones.  Plus if you used the top holes, the printhead would be able to smack straight in to the hotbed!

Now put it back together just how it came apart.

There is a veritable Rat King of wires coming off this assembly, which you’ll need to tie up with the handy cable tidy.

The end of this unholy tangle needs to be plugged into the circuit board.

But, Houston, we have a problem! There are two fan sockets to plug in to, and only one fan!

Above, we see the connector plugged into the socket suggested by the supplied pic of the board:

Luckily this is confirmed in the 29 minute build video:

That connection signifies almost the end of the build. There is only one thing left to do, and that is to connect up the highly dodgy and unsafe mains power lead.

How can that power cable be legal in a country where we aren’t even allowed to wire up our own plugs anymore? Thinking about it, the device doesn’t have a power switch, or CE approval, so plugging it in will invalidate my house insurance. But, I’ve welded stuff in the kitchen without burning the place down, and I’ve got a fire extinuisher somewhere, so what is the worse that can happen? Death, that’s what.

So, given the choice  twixt Death and the chance to print my own Daleks, the power lead gets wired in.

Before that, just a quick aside on UK wiring colours.

  • Live is Brown, but used to be Red.
  • Neutral is Blue, but used to be Black.
  • Earth is Green/Yellow.

So given these terminals and the colours of the wires,

it should be, from left to right, Red, Blue, Yellow. And it is.

So close the laughable safety flap…

… and get ready for POWER UP!

Almost. Manually crank the left and right screwed rods down so that the head is just above the plate, and move the plate around to level level it using the 4 wingnuts in the corners. Then adjust this bolt so that it makes contact with the Z-axis limit switch:

You’ll be fine tuning this later.



Slightly worried that there isn’t actually a card inserted, but it changed to “Card removed” after a short while.

And don’t peel of the blue tape like I did. Oops. But it was crumpled anway, and I’ve got loads of making tape laying around.

Assembly done! Shakedown and test printing to follow.



Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.