Update printhead.md

Author: 1coderookie

docs/hardware/printhead.md

@@ -9,7 +9,7 @@
 
 | Specifications |
 |:---------------|
-| **Feeder system**: Direct drive, single gear |
+| **Feeder system**: Direct drive, dual gear |
 | **Thermistor**: 24V, 100k NTC "EPCOS 100K B57560G104F" type, capsuled, dimensions 3x5.5mm, two pinned JST PH 2.0 connector |
 | **Heater Cartridge**: 24V, 60W, ~10.5 Ohm, dimensions 6x18.5mm, two pinned Molex Micro-Fit 3.0 (item-no. 43645-0200) connector |
 | **Nozzle**: proprietary Volcano-like nozzle (*not* compatible with Volcano!), 0.4mm |