Bear X Carriage for Bondtech Prusa Upgrade Extruder

thingiverse

## Introduction This page includes all files and information to use the Bear X axis with the original [Bondtech Prusa Upgrade Extruder MK2(S), MK2.5(S), MK3(S), Mosquito MK2.5(S), Mosquito MK3(S)](https://www.bondtech.se/en/product-category/upgrade-kits/prusa/). The original Bondtech Prusa Upgrade Extruder requires a dedicated Bear X carriage to be used with the Bear X axis. You can find this special Bear X carriage and all hardware/printed parts needed in the _Bill of Materials_ section below. Note that we highly recommend using the [Sunon fan](../hotend_fan) with the Bondtech extruder to cure inconsistent extrusion issues. ## Compatibility The Bear X carriage for Bondtech Prusa Upgrade MK2(S), MK2.5(S), MK3(S), Mosquito MK2.5(S), Mosquito MK3(S) is compatible only with the Bear X axis. The Bear X carriage for Bondtech Prusa Upgrade MK2(S), MK2.5(S), MK3(S), Mosquito MK2.5(S), Mosquito MK3(S) is **NOT** compatible with the original Prusa X axis. If you are already using the Bear X ends with another extruder, you will need the Bear X carriage for Bondtech Prusa Upgrade MK2(S), MK2.5(S), MK3(S). ## Bill of Materials This list includes extra material needed from the original Prusa extruder. | Part | Quantity (pce) | Detail | |:--------|:---------------:|--------| | Bondtech Prusa Upgrade Extruder and Motor | 1 | | | Dowel pin diameter: 3mm, length: 15mm to 15.8mm | 1 | Must fit the 2GT idler bearing. Cut a M3 screw if you can't find one | | M3 Hex nylock nuts (DIN 985) | 2 | | | M3 Hex nuts (DIN 934) | 3 | | ## Printed Parts #### Download * Download the bondtech_x_carriage_mkX.stl from this current thingiverse page. * Download the other parts listed in the table below from the [Bear extruder and X axis printed parts](https://www.thingiverse.com/thing:3716110). #### Part list and print settings * Filament type : PETG * Infill type : Gyroid recommended * Support : No * Brim : No * Detect thin walls : No * Perimeters width (internal and external) : 0.45mm | Part | Quantity | Layer Height | Infill | Perimeters | Top/Bottom Layers | |:----|:----:|:----:|:----:|:----:|:----:| | bondtech_x_carriage_mkX.stl | 1 | 0.20mm | 20% | 4 | 5 | | x_end_idler | 1 | 0.20mm | 20% | 4 | 5 | | cable_guide_back_b | 1 | 0.20mm | 20% | 4 | 5 | | cable_guide_back_a | 1 | 0.20mm | 20% | 3 | 5 | ## Assembly Guide 1. Follow the ["Bondtech Prusa i3 MK*** Upgrade Kit - Installation"](https://support.bondtech.se/c/Prusa) guide to assemble the Bondtech extruder body. 2. Assemble the Bear X axis using the [Bear extruder and X axis guide 2 "X axis"](https://guides.bear-lab.com/Guide/2.+X+axis/17?lang=en). 3. Assemble the Bear X carriage following this figure. You can use the [Bear extruder and X axis guide 4 "Extruder and X axis assembly"](https://guides.bear-lab.com/Guide/4.+Extruder+and+X+axis+assembly/20?lang=en) as support. <img src="https://raw.githubusercontent.com/gregsaun/bear_extruder_and_x_axis/master/optional_parts/bondtech_x_carriage/assembly/quick_assembly_2.jpg"> 4. Finalize the assembly with the [Bear extruder and X axis guide 5 "Final adjustments and calibration"](https://guides.bear-lab.com/Guide/5.+Final+adjustments+and+calibration/14?lang=en) using the recommended firmware and settings from Bondtech. 5. Enjoy your bondtech extruder!