Prusa i3 Rework Electronics and wiring
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Introduction | Bill of materials | Y-axis assembly | X-axis assembly | Connecting X-axis and Z-axis | Motor assembly
X and Y-axis motions | Heated bed assembly | Extruder assembly | Electronics and wiring | Marlin Firmware
Contents
Mounting electronics
Needed parts
- RAMPS
- Atmega 2650
- 4x stepsticks
- 3x Arduino washer
- 3x M3x30 mm screw
- 3x M3 nut
- 3x Ø3 mm washer
Step 1
Mount the RAMPS on the Arduino Atmega 2560. You may have to cut the solder joints located below the RAMPS power supply plug. You should have both power supply plugs on the same side.
Step 2
Plug each stepstick on the RAMPS according to the illustration below. Note the three jumpers under each stepstick. One location still free to plug a dual extruder for example.
Step 3
Fix the electronics assembly at aluminium plate rear with three Arduino washers used to electrically insulate. Power supply plugs are oriented downward. Use three M3x30 mm screws (head on the front), three Ø3 mm washers (on the RAMPS) and three M3 nuts.
Wiring
All electrical connections are summarized on the following scheme : LIEN PAGE REPRAP
Note : The second extruder may be replace by a fan to cool the print.
Endstop wiring
Plug the three endstops to the RAMPS with three connecting wires (wires with an « Endstop » mark) according to the following wiring scheme :
Motors wiring
You have to connect both Z-axis NEMA 17 motors to work in parallel. To do that, weld both power supply wires (cut in a previous step) according to their colors : red/red, green/green, blue/blue and black/black. We strongly recommend you to protect each weld with heat shrink tubing or an insulating adhesive tape.
NEMA 17 wires color can change depending on the supplier and there is no risk in case of a wrong wiring. Indeed, the wires are always associated in pairs (one pair for each coil). SO there is no risk if the color of supply wires doesn’t match the wiring diagram.
Resistor and PCB heatbed wiring
The resistor is not polarized and is pluged to D10.
PCB heatbed is pluged to D08. Make sure to not invert the positive and negative poles.
Thermistors wiring
The thermistor is not polarized. Make sure to not invert the PCB heatbed thermistor and the Extruder thermistor.
Fans wiring
Plug the extruder fan directly to his dedicated power supply pins (see illustration below).
If you have a fan which is cooling the electronics, plug it directly to the RAMPS.
If you have a fan which is cooling the print, plug it to D09.
Power supply wiring
The principle power supply wire is not included. You have to strip an end of a power cable and to connect to the power supply (L, N, G plugs). Make sure to do this operation properly.
The power supply is connected to the RAMPS with additional connecting wires. You have to strip both ends, make sure to follow the scheme correctly.