Maker PETCraft tested how many discarded plastic bottles it takes to produce one kilogram of 3D-printing filament: thirteen 5-liter bottles, one 10-liter bottle, two 8-liter bottles and one 1.5-liter bottle, or 17 in total.
The bottles were heat-smoothed, cut into strips with a homemade cutter, then drawn through a heated nozzle and wound into filament. Printing with the result is a future step.
Recycling one kilogram of filament required collecting and processing 17 enormous bottles. Saving material turned into a surprisingly large manufacturing project.
Matt Denton's Spoolbot looks almost exactly like a 2 kg spool of 3D-printer filament, complete with real filament wrapped around the outside. At a glance, there is little to suggest that it is a mobile robot.
Inside are an ESP32-C3-based controller, IMU, RC receiver, geared DC motors, and battery packs used as ballast. The spool's black end discs act as the wheels, while the internal frame stays upright as the shell rolls around it.
A part whose entire job is to sit beside a 3D printer holding filament has been turned into a robot without giving up the disguise. You might not notice anything unusual until the spool drives away.
Recycling one kilogram of filament required collecting and processing 17 enormous bottles. Saving material turned into a surprisingly large manufacturing project.