1. 2.5mm Allen key
    • 2.5mm Allen key

    • Needle-nose pliers

  2. Rambo-cover-base (new version)
    • Rambo-cover-base (new version)

    • Rambo-cover-base (older version)

    • Rambo-cover-door

    • Rambo-cover-hinge top

    • Rambo-cover-hinge bottom

    • Casing parts can slightly differ from pictures.

    • Insert M3nS (1pcs) all the way in.

    • To insert the nut, use the screwdriver.

    • M3x10 screws (2 pcs)

    • Use the highlighted holes.

    • In the next step use the highlighted hole.

    • Tighten the Rambo cover hinge bottom to the frame using one M3x10 screw and supplied 2.5 mm allen key.

    • Place the rambo-cover-door on the hinge.

    • M3x10 screw (1 pcs)

    • Rambo-cover upper hinge

    • Insert M3x10 screw into the hinge.

    • Move the heatbed all the way towards the LCD for easier access.

    • Assemble the Rambo-cover doors on the lower hinge attached to the frame and slide the upper hinge in place.

    • Fasten the Rambo-cover upper hinge into the highlighted hole.

    • Secure the upper hinge to the frame.

    • Make sure both hinges are vertical and parallel to the edge of the frame.

    • There are two versions of Rambo cover base:

    • New version with no vents on the back. Insert M3n nuts (4 pcs) in nut traps.

    • Older version with vents on the back. Insert M3n nuts (4 pcs) in nut traps.

    • In the next steps the older version is used. However, their functionality is the same.

    • M3x10 screws (4 pcs)

    • Slide the electronics into the Rambo cover base and secure the board in place using M3x10 screws.

    • Use the needle nose pliers to help with positioning the screws.

    • "Snap" the RAMBo-cover-base on the prepared screw.

    • Insert the X-axis cables (motor and endstop) through the hole in the RAMBo-cover-case.

    • Secure the screw with 2.5 mm Allen key.

    • Slide X-axis cables through the Rambo cover while attaching the Rambo cover base to the frame as shown in the picture.

    • Before tightening the cover, ensure the cables from motor and endstop can reach upper edge of the RAMBo board.

    • The spiral wrap must run into the Rambo cover so it is held in place when tightened up.

    • Tighten the Rambo cover base to the frame using supplied 2.5 mm Allen key. There is a slot (hole) in the cover base for the Allen key to tighten the upper screw.

    • X-axis motor

    • Y-axis motor

    • Z-axis motors (the order of Z-motors doesn't matter )

    • X-axis endstop

    • Y-axis endstop

    • Low voltage main cables (wires going out from PSU, the order doesn't matter)

    • Connect cables and arrange cables as shown in the picture. Check all connectors are properly plugged in!

    • All motor cables have their markings for easier assembly.

    • Guide the cables from the heatbed through the bottom hole of the Rambo cover base.

    • Note: in case of a textile sleeve there is no NYLON filament present, simply skip the nylon insertion.

    • Push the filament all the way down through the filament holder hole in the Rambo cover base.

    • Heatbed thermistor

    • Heatbed heater

    • Note the white cable from heatbed can be also in black version, however their function is the same (see Chapter 7, Step 13).

    • Using a ziptie, tie the cables from the heatbed to the Rambo cover base at the end of the spiral wrap.

    • Double check the zip tie is tied firmly.

    • Guide the cables from the extruder through the top hole of the Rambo cover base.

    • Push the filament all the way down through the filament holder hole in the Rambo cover base.

    • Force the last spin of the spiral wrap into the hole of the Rambo

    • Using a ziptie, tie the cables from the extruder to the Rambo cover base at the end of the spiral wrap.

    • There is a slot for the zip tie, simply push the zip tie in.

    • Tighten the zip tie and cut the remaining part.

    • P.I.N.D.A. probe

    • Extruder motor

    • Heatbed heater

    • Extruder heater

    • DOUBLE CHECK the connection! It is so important to ensure the correct connections.

    • Extruder thermistor (cable going from the extruder labeled with Yellow/Green heat shrink) [Orientation does not matter]

    • Heatbed thermistor (white or black cable going from the heatbed)

    • Front print fan (cable going from the extruder labeled with Red heat shrink)[make sure that the red wire is closer to the thermistor]

    • Left hotend fan (cable going from the extruder labeled with Blue heat shrink)

    • DOUBLE CHECK the connection! It is important to ensure the correct connections!

    • LCD cable with ONE stripe (Connector P1)

    • LCD cable with TWO stripes (Connector P2)

    • Make sure that the key of connector is matching the key on the electronics.

    • The pink strip on the LCD cables should be facing upwards.

    • Check your electronics connection with the attached picture.

    • M3x40 screw (1 pcs)

    • Close the Rambo-cover doors

    • Make sure that no wire is pinched!

    • Tighten M3x40 screw.

    • Congratulations, you've just assembled the whole Original Prusa i3 MK2S 3D printer!

    • You're almost there... Just finish the chapter 9. Preflight check

Finish Line

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Josef Prusa

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18 Comments

The walls of the rambo covers are very thin, watch out not to break them when assembling and mounting to the frame.

Robert S. - Reply

Hi Robert, when assembling the printer, you shouldn't be applying excessive force to any component, however, all printed parts are designed to sustain the assembly.

Jakub Dolezal -

I had to trim some cable wrap from the Extruder bundle so it would fit correctly into the Rambo base very fiddly

Neil Winstanley - Reply

Hi Neil, lengths of all cable wraps are designed to fit the printer without trimming. How many "turns" you had to cut?

Jakub Dolezal -

I had to trim some too, there was no way you would ever get the 3mm ABS rod into the hole without doing so. I'd say probably 1-1/2 wraps. After doing that it went right in.

After seeing the picture of another guys wiring, I wish I would have used the mesh (orange) instead of this hard spiral wrap.

Randy H -

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