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Constructing a 3D Printer [Prusa I3]

SECTION 5 - Electronics - Page 1

Section 1 - Wooden frame : part 1 - part 2 - part 3
Section 2 - Y Axis : part 1 - part 2 - part 3
Section 3 - X-Z axis : part 1 - part 2
Section 4 - Extruder : part 1 - part 2 - part 3
Section 5 - Electronics : [[ part 1 ]] - part 2 - part 3
Section 6 - Coarse Calibration & Software : part 1 - part 2 - part 3
Section 7 - Fine Calibration & Software : part 1 - part 2 - part 3
Section 8 - Extras : part 1 - part 2 - part 3
Section 9 - Maintenance & Modding : part 1 - part 2

LETHAL VOLTAGES INVOLVED. I DO NOT TAKE ANY RESPONSABILITY FOR ANY DAMAGES. PROCEED WITH CAUTION

We need a schematic in order to construct our printer.
The schematic can be found below :
electronics prusa i3



We unbox our power supply (S-250-12 5V / 20A MAX) electronics prusa i3

Select your input voltage (220/110V). In Europe we use 220V.
electronics prusa i3

electronics prusa i3

Front view of the power supply :
electronics prusa i3

For security reasons we have to make a front cover for our power supply.
We need :
3 pieces 165x20x10mm for the front panel
2 pieces 60x20x10mm for the legs
1 piece 145x20x10mm for the top
1 piece 165x20x10mm for the top part 2
10 M3 woodscrews 20 mm long
Wood glue


The schematics can be found here [open the dxf with LibreCAD]
In order to open the included 3D Model use FreeCAD.

Assemble the front mask like below :
electronics prusa i3

electronics prusa i3

The three red cylinders indicate the screws that fix the mask on the power supply.

Glue the panel using clamps
electronics prusa i3

Put the screws on the front
electronics prusa i3

Lateral view :
electronics prusa i3

Back view :
electronics prusa i3



electronics prusa i3

Finished panel :
electronics prusa i3

Notice this is another panel but the design is the same.
Make the two front cuts using a drill and a rasp.
electronics prusa i3

Cut 4 pair-wires like the photo below. (60cm up to 1 meter each)
electronics prusa i3
You have to mark the negative pole of each pair.
The negative pole is marked with a black strip
Use a multimeter if you are not sure.

Place the wires.
Notice two pairs are in parallel (used for the heatbed).
The forth pair is indicated by the red and black line.
electronics prusa i3

Now cut your 220V cable carefully
electronics prusa i3

We are using a rocker DPST switch with light. Model KCD4-201N 4 Pin ON/OFF 2 Position.
Rated : 16A/250V AC, 20A/125V AC
Grind the legs of the 220V switch
electronics prusa i3

Place the switch into the panel and solder the 220V switch with the power cord.
Use heatshrink tubes in order to isolate the live connections.
Notice that this kind of switch has polarity in order to function correctly the led.
electronics prusa i3

Pass the 12V cables through the slot (4 pairs).
Double-check the polarity of the 220V cables and of the switch.
Shrink the heatshrink tubes. Or isolate using hotglue. electronics prusa i3

Now screw the 3 pairs into the Ramps 1.4 jack like the photo below .
Notice that the black sign is the negative pole.
Notice again that the left line (11A) has two parallel cable pairs.
electronics prusa i3

IMPORTANT Double/triple check your 220V and 12V connections :
electronics prusa i3

Screw the wooden mask into your power supply.
The final result of our power supply :
electronics prusa i3

Add a 80mm fan over the top using zip ties.
Fix the 220V power cable with zip ties also on the power case.
electronics prusa i3

electronics prusa i3

Use the forth cable pair in order to power the fan.
electronics prusa i3

CAUTION re-check everything before pluging the power supply into the mains.
Make sure that the 12V cables are not shorted. Test the power supply using a multimeter : electronics prusa i3

If you get 12 - 12.5 V you are good to go .
If you are way off then shut down the power, remove the plug from the mains, unscrew the wooden mask and adjust the trimpot with a screwdriver shown below :

electronics prusa i3

Do not adjust this trimpot with the mains plugged.


Notice that the power fan should work.

In the next part we will see how to connect Ramps in our system.

Section 1 - Wooden frame : part 1 - part 2 - part 3
Section 2 - Y Axis : part 1 - part 2 - part 3
Section 3 - X-Z axis : part 1 - part 2
Section 4 - Extruder : part 1 - part 2 - part 3
Section 5 - Electronics : [[ part 1 ]] - part 2 - part 3
Section 6 - Coarse Calibration & Software : part 1 - part 2 - part 3
Section 7 - Fine Calibration & Software : part 1 - part 2 - part 3
Section 8 - Extras : part 1 - part 2 - part 3
Section 9 - Maintenance & Modding : part 1 - part 2



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