Prusa i3 Mk2/S upgrade with hybrid Mk2.5 R3 extruder
Description
PDFThis is a direct copy of https://www.thingiverse.com/thing:3062641 by user baloan. The author clearly put a ton of work into this, and hopefully this will help more folks see it. Thanks baloan!
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The hybrid Mk2.5 R3 extruder can be installed as part of
- a Mk2S upgrade from a Mk2, or
- standalone upgrade from a Mk2S.
Goal
- Upgrade to the latest Mk2.5 R2 and Mk3 R3 parts to benefit from the improvements made.
- The Mk2 PINDA probe requires adjusting Live-Z due to temperature sensitivity after long prints and when the heatbed temperature changes. Upgrading to PINDA V2 should get rid of manual Live-Z adjustments.
- Save the money for the Mk2.5 upgrade. I neither need the spring steel heatbed nor the Bondtech extruders. I'd rather invest the money in upgrading to Mk3 24V electronics (Einsy, 24V heatbed etc).
The upgrade aims to provide these features:
- PINDA V2 with temperature compensation, 4 pin (requires cable adapter and modified Mk2 3.1.0 firmware)
- Noctua fan, 5V, 3 pin with rpm information (requires cable adapter, much quieter than the original Mk2 fan turbine)
- R3 extruder body, Dyson version (blog entry)
- 45 degree fan nozzle for better print cooling
- Mk2S x-carriage with improved cable support
- Mk3 Einsy/Rambo board enclosure with improved extruder cable support
Parts that are NOT upgraded
- Mk42 12V heatbed
- 5015 print fan, 12V, 2 pin, no rpm information
- one pulley filament extruder (works fine for PLA, PETG and ABS, the Bondtech gears improve soft filament extrusion)
- filament sensor
What you need to buy
Links point to the Prusa shop where I bought parts. If you buy elsewhere you will need to cut the cables to length.
What you need to build
- adapter cables for PINDA V2 and Noctua fan, see picture and Mk2S to Mk2.5 assembly guide, Step 16. This Prusa forum entry describes where to buy compatible plugs and sockets.
I have completed a backport of the the PINDA V2 temperature compensation code at https://github.com/baloan/Prusa-Firmware.
Parts list
| Part | Version | Remix | Material | Comment |
| Mk2SE-extruder-R3-heatsink.stl | Mk2S & Mk2.5 R3 | Hybrid | ABS | Combination of Mk2 extruder upper and R3 hotend lower part. Designed with: OpenSCAD and Microsoft 3D Builder |
| extruder_cover.stl | Mk2.5 R3 | Original | ABS | |
| extruder_idler.stl | Mk2 | Original | PETG | |
| nozzle-fan-45deg-support.stl | Mk2.5 R3 | Original | PETG | |
| nozzle-fan-45deg.stl | Mk2.5 R3 | Original | ABS | Nozzle gets hot. ABS is mandatory. |
| Mk2-R3-x-end-motor-w-switch.stl | Mk2 & Mk3 R2 | Hybrid | PETG | Added Mk2 end stop switch mount to Mk3 R3/x-end-motor.stl. Designed with: Microsoft 3D Builder |
| x-end-idler.stl | Mk3 R2 | Original | PETG | The idler mounts have been strengthened. |
| x-carriage.stl | Mk2.5 | Original | PETG | Provides better support for cables then Mk2 part. I have not considered the Mk3 x-carriage as I am not sure whether it's compatible. |
| Einsy-base.stl | Mk3 | Original | PETG | The Einsy-base.stl is comaptible with the RAMBo-cover-door.stl and the Rambo board. It provides improved extruder cable support, similar to the Mk2.5 Rambo-base.stl. |
| i3-x-strain-relief-straight.stl | thingiverse | Remix | PETG | The x-motor and endstop cable outlet points backwards to keep the cables from touching the enclosure walls. |
Note: PETG parts should also work in PLA (untested)
Tags
Model origin
The user re-uploaded this model. The user is not the original author of the model.
