Prusa i3 Leadscrew, Bearing, ZStop, Belt tension upgrade

thingiverse

This is an upgrade design for my Reprap Prusa i3. It includes X Motor and Idler end replacements to make use of trapezoidal lead screws, improved bearings for the smooth rods and a belt tensioner adjustment. I found the original design using the original linear bearings to be fragile. I've also added a Z Stop to the motor end. I've included holes on the top z shaft mounts for KP08 pillow block ball bearings (https://www.amazon.com/gp/product/B00W8W7RNG/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1) to further steady the trapezoidal lead screws. I don't have them installed on mine at this time however as my motors won't drive the additional load they impose. Thanks to:http://www.thingiverse.com/thing:111903 for the X adjust inspiration. Although I redrew everything from scratch, the design is almost identical to burtdonalds. http://www.thingiverse.com/thing:542892 for the Z end stop idea. I've used the Blackhawk Prusa i3 ReWork - Adjustable Z Endstop in my printer, and incorporated the design into this upgrade. Take a look at my X Stop design at http://www.thingiverse.com/thing:1798572. EDIT: Updated the Z Shaft Mount STL files as it appears I may have had one wrong. My apologies. I've added different length Z Stop arms that mount to the X Axis assembly to accommodate different extruders. Pick the one that works for you. The short version should always work, but will require a longer screw. The medium version is the original length. I don't know if the long version will be of any use to anyone, but it is included. EDIT 08-08-18 Added the SketchUp file so that others can improve upon the design. I've effectively abandoned my i3 clone for the time being as I am working with another printer when I have time. Print Settings Printer Brand: RepRap Printer: Prusa i3 Rafts: No Supports: No Resolution: 0.2 Infill: 20% Notes: Support is needed for the Z Stop arm, the X Motor end, and the left side Z motor mount. I may manually add some support material to these parts in the model files as Slic3r tends to add support even where I don't need it. Custom Section Required hardware, etc. T8x2 (200 mm, single start) trapezoidal lead screws - 2 ea. 5mm to 8mm NEMA 17 coupler - 2 ea. KP08 Pillow Block bearings - 2 ea. (optional) SCS8UU Linear Motion Ball Bearing - 2 ea Misc. hardware. The left X motor will require two longer screws then the tradition Prusa i3 to accommodate the z-stop. The SC8 bearing hardware is a new requirement, as well as the belt adjust screw and nut. I used a spare spring on the Z stop screw to prevent it from changing position from vibration.