Filament Diameter Gauge

thingiverse

I've got some filament spools for free, but later discovered that the diameter is not very consistent. The extruder was jamming on "blobs" of filament larger than 1.9 mm. Rather than measuring the whole spool using a caliper, I designed this simple stencil. Then just unroll the filament through the appropriate slit to find and cut off the problematic sections. The design uses minimal material. WARNING: This stencil requires printing in abrasive-resistant filament. If using regular PLA, it will quickly wear away. Also, your printer needs to be precisely calibrated, otherwise the holes will be significantly smaller. The slits are usually okay, though you should check the real gap dimension using a caliper.