http://www.thingiverse.com/thing:126778 http://airtripper.com/1676/3d-printer-extruder-filament-drive-gear-review-benchmark/ The more improvements and new features added to the Sumpod 3d printer the more I want to use the 3d printer, and adding better filament handling has gone a long way to improve the 3d printer's ease of use. The Sumpod's sturdy construction has allowed me to set up a filament spool rack on the top of the printer. airtripper.com The details are on the blog: http://airtripper.com/1021/sumpod-3d-printer-filament-handling-for-extruder/Reel rollers are here: http://www.thingiverse.com/thing:21435