How to Install the Prusa i3 (MK3S+) Mosquito® Upgrade Kit
The Prusa i3 (MK3S+) Mosquito® Upgrade Kit has all the necessary components to replace your stock i3 MK3S+ hotend with a new Slice Engineering® Mosquito hotend. This kit replaces not only the stock hotend but also parts of the stock extruder assembly.
Follow along with this guide to see all the steps necessary to transform your stock machine into a Mosquito-driven powerhouse. These instructions were created and photographed with a stock Prusa i3 MK3S+ printer.
Prusa i3 (MK3S+) - Mosquito®
- The Mosquito® Hotend
- Mosquito® Silicone Boot
- BridgeMaster® 0.4 mm Nozzle
- Boron Nitride Paste (5cc) w/ Applicator Swabs
- Hotend Wrench Set (2.0 mm, 1.5 mm, and 1.3 mm hex keys)
- PTFE Tubing (27.5 mm)
- Printed Extruder Components
- Assembly/Disassembly Aid Placemat
- 2.5 mm hex key
- Adjustable wrench and/or pliers
Removal and Disassembly of the Existing Hotend
Before removing the current hotend, you may find it easier to remove any filament that is currently loaded. While this is not required, it will make the process easier. Follow all standard safety steps while removing filament from the hotend.
A placemat has been included with the Prusa i3 (MK3S+) Mosquito® Upgrade Kit. As parts are removed from the printer, they can be set in the designated square on the placemat for easy retrieval during assembly.
- Ensure the hotend has been allowed to cool down to ambient temperatures.
Turn off the power to the printer and remove the power cord.
Using a 2.5 mm hex key, remove the two M3x20 screws attaching the part cooling fan to the extruder.
Using a 2.5 mm hex key, remove the three M3x14 screws and the one M3x20 screw attaching the hotend cooling fan to the extruder body.
Using a 2.5 mm hex key, remove the two M3x40 screws directly under the extruder stepper motor securing the extruder cover to the extruder body.
Remove the extruder cover.
Using a 2.5 mm hex key, remove the
Part Cooling Fan Support Arm from the extruder cover. At this point, the extruder cover can be stored as it will not be used again.
Using a 1.5 and 2.0 mm hex key, loosen the two screws on the underside of the hot block securing the thermistor/heater cartridges to the stock hot block. You may need to hold the hot block with a wrench or pliers to loosen the screws successfully.
- Remove the heater and sensor cartridge from the hot block.
Using a 2.5 mm hex key, remove the M3x10 screw located on the top of the extruder body attaching the filament sensor cover to the extruder body. The screw and cover can now be removed.
Using a 1.5 mm hex key, remove the M2x8 screw located on the top of the IR filament sensor. Once the screw is removed, gentle remove the sensor from the extruder body and push it out of the way.
Using a 2.5 mm hex key, remove the top two M3x40 screws on the back side of the x-carriage. These screws can be left in the x-carriage for later assembly, as shown in the second image.
Gently pull th
e extruder stepper motor away from the extruder body.
Remove the stock hotend from the extruder body. Using a 2.5 mm hex key, remove the m3x10 screw clamping the SuperPINDA Sensor to the Extruder Body. Once the screw is removed, remove the SuperPINDA Sensor.
Using a 2.5 mm hex key, remove the M3x18 screw attaching the filament sensor lever to the extruder body.
Using a 2.5 mm hex key, remove the M3x40 extruder tensioning screw and spring.
Using a 2.5 mm hex key, remove the two M3x10 screws attaching the extruder body to the x-carriage.
Remove the filament guide adapter and the steel ball from the extruder body. Care must be taken to avoid losing the steel ball.
Using pliers, grab the 20x6x2 magnet and remove it from the extruder body. The extruder body can now be removed as it will not be reused.
Using a 2.5 mm hex key, remove the two M3x10 screws attaching the extruder motor plate to the extruder stepper motor. The extruder motor plate can now be removed as it will not be reused.