UP Plus or Affinia - Spring Biased Filament Lever

The stock UP printer has a fixed filament guide and so it sometimes suffers from slippage when the filament diameter isn't perfect. This takes care of that to a large degree. It re-uses the original bearing. I haven't redesigned the main extruder housing to accommodate this, so you'll have to do some trimming and gluing on the original. If anyone does redesign the housing to fit this lever, please post a link.

Includes four files: A pivoted arm that holds the original bearing, a fixed guide