16.1 Installation and Wiring of the Bondtech MK3S Mosquito Extruder

(1) 2.0x75mm Hexagonal Screwdriver

(2) 2.5x75mm Hexagonal Screwdriver

(3) 1.5x60mm Hexagon Socket Head Screwdriver for Electronic Applications

(4) 0.4x2.5mm Insulated Screwdriver Slotted Screws

(5) Diagonal Cutter

(6) Lighter

(7) Boron Nitrid Paste

(8) Pliers Wrench

(1) Heater Cartridge

(2) Thermistor Extension Cable

(3) Terminal Block

(4) Zip Ties

If you are building a Caribou 320 or 420 you will need the following extension cables:

(5) Filament Sensor Extension Cable

(6) 2x Fan Extension Cable

(7) 2x Motor Extension Cable 20cm

(1) Dowel Pin

(2) 2GT Toothless Pulley

(3) GT3 Belt

(4) xy-Belt Tensioner Insert

(5) 2x M3 Plastic Washers

(6) M3 Self Securing Nut

(7) M3 Washer

(8) M3x18mm Hexagon Socket Head Cap Screw

(1) x-Carriage Back (Top)

(2) Belt Holder

(3) x-Carriage Back (Bottom)

(4) x-Cable Holder

(1) Techflex-Cable Tube (Diameter 12,7mm)

Caribou 220: 45cm

Caribou 320: 55cm

Caribou 420: 65cm

(2) Nylonfilament

Caribou 220: 47cm

Caribou 320: 57cm

Caribou 420: 67cm

(1) M3x10mm Hexagon Socket Head Cap Screw

(2) 2x M3x14mm Hexagon Socket Head Cap Screws

(3) 2x M3x16mm Hexagon Socket Head Cap Screws

(4) 4x M3x22mm Hexagon Socket Head Cap Screws

(5) M3x40mm Hexagon Socket Head Cap Screw

(6) 2x M3x45mm Hexagon Socket Head Cap Torx Screws

Turn your 3D printer around.

Move the x-axis to the upper third of the z-axis and push the two bushings on the x-axis to its center.

Check whether the two square nuts are located in the lower part (insertion for the lower bushing) of the x-carriage.

Hold the extruder against the bushings and make sure they are positioned in their designated openings.

Cover the upper bushing with the back of the x-carriage. Then, fasten the x-carriage back to the extruder with 4x M3x22mm Hexagon Socket Head Cap Screws.

Take the xy-belt tensioner insert and enlarge one of the two holes on its side (e.g. with a 2.5x75mm hexagonal screwdriver).

Slide a dowel pin through the hole you just enlarged and push it in until it is just visible inside the xy-belt tensioner insert.

Place a M3 Plastic Washer on the dowel pin. (Fig. 2).

Now place a toothless pulley on the dowel pin. Continue to push the pin down until it reaches the end of the toothless pulley (Fig. 1).

Place a M3 Plastic Washer on the toothless pulley and, with the pliers wrench, push the dowel pin as far as possible through the opening of the xy-belt tensioner insert (Fig. 2)

Finally, place an M3 Self-Securing Nut into the designated slot. Press the nut completely into the slot.

Pay attention to the orientation. The blue circlip must point towards the pulley.

The xy-belt tensioner insert is now fully assembled.

Since you will need a second xy-belt tensioner insert for the x-axis, you can build another one in this step.

Insert the xy-belt tensioner insert into the idler.

Take the second half of the GT3 belt and shorten it to the length of 82 cm.

Cut the remaining GT3 belt to the length of 82cm.

Pull the belt through the xy-belt tensioner insert (Fig. 2).

Push the end of the belt to approximately the center of the mount provided for it in the x-carriage.

Place the GT3 belt around the GT3 toothed pulley on the stepper motor at the x-motor holder.

Slide the xy-belt tensioner insert into the y-Idler.

Secure the xy-belt tensioner insert with an M3 Washer and an M3x18mm Hexagon Socket Head Cap Screw.

Make sure the strap holder is flush with the idler for this step.

Now, guide the belt back to the x-carriage. If the two belt ends are overlapping in the middle, cut the protruding end.

Place the belt holder in the x-carriage.

Fasten the belt holder with 2x M3x45mm FlatHead Screws.

Cut your nylon filament so that the length fits your printer model (see Step 5).

Now, cut a slanted edge from one of the ends to make it pointed.

Insert the pointed end of the nylon filament into the left hole in the center of the x-carriage.

Use a M3x10mm Hexagon Socket Head Cap Screw in the right hole in the center of the x-carriage to attach the nylon filament.

After that, pass the pinda cable, the filament sensor cable, the motor cable, the two fan cables and finally the nylon through the hole in the center of the x-carriage back (bottom).

Attach the x-carriage back (bottom) using 2x M3x16mm Hexagon Socket Head Cap Screws.

Fasten the x-cable holder to the extruder with a M3x40mm Hexagon Socket Head Cap Screw.

Loosen the M2x5mm Hexagon Socket Head Cap Screwon the Slice Engineering Hotend.

Open the boron nitride paste and apply it to the heater cartridge and the thermistor cartridge.

Insert the heater cartridge into the lower opening and the thermistor into the upper opening in the hotend. Secure both with a (previously removed) M2x5mm Hexagon Socket Head Cap Screw.

Cut Techflex tube and nylon to fit your printer model (see Step 5).

Cut an approximately 3x2cm rectangle from on one side of the Techflex tube (about 5cm before the end of the tube).

The two ends of the Techflex tube are then briefly heated with a lighter.

Push all the cables and the nylon filament through the Techflex tube you just prepared. Here, the end of the tube with the cut-out rectangle must be directed at the extruder.

Slide the Techflex tube completely into the x-cable holder and align the rectangle with the bottom to position the heater cartridge and thermistor cartridge cables there.

Now, route the heater cable and thethermistor cable through the rectangle and into the Techflex tube.

Secure the cables in the x-cable holder with 3x Zip Ties.

If you are building a Caribou 320 or Caribou 420, you will need to extend the pinda cable and extruder motor cable with a motor extension cable, the filament sensor cable with a filament sensor extension cable, and both fan cables with a fan extension cable.

Attach the Techflex tube to the Einsy box using the cable holder (straight) and 2x M3x14mmm Hexagon Socket Head Cap Screws.

Use a screwdriver for slotted screws to loosen the two screws on the terminal block.

Push each of the two cable ends of the thermistor cartridge into one opening and secure them.

Now, connect the components to the board:

Heater cartridge

PINDA2 / SuperPINDA

Filament sensor (lower row of pins at the tub connector, white cable to the left)

Thermistor

Extruder-Fan (left), Radial-Fan (right)

Extruder-Motor

The extruder is now completely wired.

The installation of the extruder is completed now.

Continue with instructions 17. Installation of the Upper x-Profile.