Prusa i3 Mk2s MMU Modified Extruder For Bowden Style Input
Description
I Didn'T Like The Feed Input To The Extruder, And If You Have The Spools Above The Printer, The Filament Can Rub The Extruder, And In My Case Make A Squeaking Noise That Was Annoying. But This Is Also Part Of A Frame Support For 4 Filament Rolls, And I Was Using The 4Mm Od Ptfe Tube. But I Felt That Some People Might Want Just The Extruder To Fit In With Their Setup Parts List: 2 Modified Extruders 4 M5 X 7Mm Brass Inserts 4 Festo Qsm-M5-4 Push-In Fittings 4Mm Od 2Mm Id Ptfe Tube (Cut To Length) I Used M5 X 7Mm Brass Inserts That I Found On Ebay. Loads Available For Not Allot Of Money. I Tried To Match What Prusa Used, By They Worked Out Very Expensive In Comparison. I Used Festo Qsm-M5-4 Push Fittings I Purchased From Rs Online. These Are The Same As The Ones Prusa Inlcuded With The Mmu Https://Uk.Rs-Online.Com/Web/P/Pneumatic-Straight-Threaded-To-Tube-Adaptors/1216037/ I Reused The Brass Insert From The Prusa Extruder. I Screwed In A Push Fitting (A Screw Or Bolt Will Do, I Just Didn'T Have Any M5 Fixings Here) And With A Bit Of Force And A Pair Of Pliers, You Can Wiggle And Pull The Existing Brass Inserts Out. Also Take The Short Ptfe Tube As Well. All Brass Fittings Are Press Fit, Or If You Want You Can Heat Up The Plastic Before Pushing In. I Used A Vice. Don'T Forget To Fit The Short Ptfe Tube. I Have Made The Hole 7.1Mm, This Is Do To Material Expanding And Making The Hole Smaller 4 Roll Frame Holder Https://Www.Thingiverse.Com/Thing:2822310 When Cutting Ptfe Do Not Use Side Cutters, It Crushes The Tube Before Cutting And Makes It Oval, Which Makes It Harder For The Filament To Push Through. Use A Sharp Craft Knife And It Stays Round.
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