Reinforced minimal MK8 w/ soft-PLA printing spur
Description
A Re-Re-Re-Work Of The Minimalist Mk8 Replacement. The Originals I Printed Suffered After Several Km Of Filament From "Arm Fatigue" (See Gallery, Orange Pla) Which Gradually Reduced The Applied Filament Pressure... Bad For Lots Of Things, But Most Esp. Fast Printing. Although This Basic Design Has Evolved Nicely (E.G., Http://Www.Thingiverse.Com/Thing:53125)... And Those Other Works Largely Solve It, This Design Also Solves A Problem With Printing The Soft/Flexible Pla Filaments... Herniation! Or Something Like It... Basically, The Uber-Flexible Filament Blurts Out From The Space Between The Hobbit And Entry To The Hot End.(Even At <15Mm/S). This Re-Re-Re-Work Adds A Bore Along The Arm For A #4-40 Cap Bolt (Self-Threading) To Prevent Fatigue, Modified The "Spring" Pit For A Tighter Fit (Still A Delta Faucet Spring Like Wjsteele'S), And Extended A "Spur" Down Into The Hotend Nut To Prevent Filament Herniation. With This Verion Of The Minimalist Mk8 I Can Print Flexible/Soft Pla At >40Mm/S Without Problems. Though, Short Of Lubricating The Filament, I Need To Avoid The Filament Feed Tubes Because They Bind-Up During A Print (Too Much Friction, Or Maybe Stiction).
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