Aluminium Prusa i3 X-Carriage for Chimera and 18mm Sensor
Description
Using The Leftover 6Mm Aluminium From My Frame, I Created An All-Metal X-Carriage For My Prusa I3 To Hold A Chimera Dual-Head Bowden Extruder And An 18Mm Diameter Inductive Proximity Sensor For Bed Levelling. The 40Mm Fan Duct Blows From Behind In A Ring Pattern. I Glued The 2 Sections Together With Rubber Cement Type Glue. The Fan Duct Works Fairly Well But Obscures Access / Vision To The Nozzles Somewhat. I Have Made A Simpler Version 'Fan Duct Lower V2' Which Works A Bit Better And Gives Better Vision. I Needed To Put M3 Helicoils Into The Mounting Holes Of The Sc8Uu To Get This To Attach Firmly. Note - There Is An Issue With This Design, As The Carriage Heats Up The Sensor Drifts Quite A Lot. I Am Planning To Add Insulating Washers To The Sensor Bracket, Or Re-Make The Sensor Bracket From Plastic To Help To Combat This. Metal Parts Cut On A 6090 Router Using A 3.175Mm Single Flute Bit. The Grooves In The Backplate Are 2Mm Deep. Assembly - Drill Through The 3Mm Holes From The Backplate Into The Extruder Bracket And Sensor Bracket With A 2.4Mm Bit Then Tap To M3. Similarly Drill Into The Carriage Web. Use M3 X 10-12Mm Screws For This Purpose. You Need To Drill And Tap 2 Sc8Uu Bearings On One Side In The Middle To Hold The Belt Bracket (See Photo). Use M4 X 10-12Mm Screws To Hold The Sc8Uu Bearings; Use Countersunk Screws Behind The Chimera. I Drilled And Tapped The Set Screw Holes In The Chimera Body Through To The Front, So I Can Adjust The Nozzle Heights Easily By Just Taking The 30Mm Fan Off.
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