Skelestruder is a custom 3.5:1 (or 4:1) geared extruder with mostly printable parts for the Prusa Mk3, designed by JLTX
Link to parts https://www.thingiverse.com/thing:2845416/#files
Improved instructions >>> Skelestruder Assembly
Sortable, filterable spreadsheet with part/file names, and recommendations for material and color is available here.
