This Timing Pulley has 10 teeth. it is made of Aluminium with a set screw for attachment. Bore diameter is 5mm. It has 2 flanges (dia 20mm) suiting a belt width up to 6mm. Overall length is 17mm.

The DM542A is a type of two-phase hybrid stepping motor driver for one motor. It is designed for use with 2-phase hybrid stepper motor of all kinds with 42mm to 86mm outside diameter and less than 4.0A phase current.
Input Voltage: 18VDC to 50VDC.
Input Power: <4A up to 80W
Output Current: 1A - 4.2A(peak)
Inputs and Outputs are opto-isolated.
Overvoltage, under voltage, overcorrect, phase short circuit protection
Operating Temperature: -10 to 45 degreesC
15 channel subdivision and automatic idle-current reduction. 8 channels output phase current setting
Replaces the older MD542 Driver

All the nuts bolts, washers, springs and more you need to put together a Wades or Gregs extruder - see the more info for a full parts list. Does not contain plastic parts, barrel or the hot end.

Timing Pulley, T2.5 pitch, 16 teeth, Twin Flange to suit belt up to 6mm

This Brass gear mounts onto the shaft of the extruder stepper motor and pushes the filament (1.75 or 3mm) into the hot end.

This pulley is made of fibergrass reinforced polycarbonate. It no longer has an Aluminium Hub with a set screw for attachment. It has a single flange and suits belts up to 9.5mm wide. Overall length is 20.64mm Flange Diameter is 25.1, hub diameter 12.7mm, with a 4.763mm bore to suit our Nema17 stepper motors.

T5 belt is not compatible with this pulley - see T5 pulleys

Nema 17 motor with a planetary gearbox fitted - reduction ratio 1:5.18 - awesome for extruders.

Use this mounting bracket to mount a Nema23 motor at right angles to a surface

Nema 17 motor with a planetary gearbox fitted - reduction ratio 1:26.8 - super grunty for this size.

This flexible Shaft Coupler is design to mate between two 5mm shafts

This stepper motor is used in the new universal mini extruder for repraps.

This stepper motor is the standard for smaller 3d printers such as the RepRap Wallace and Printrbot machines

This heatsink (40x 40 x 11mm high) is designed to fit on the back of a Nema 17 stepper motor, or the front of a Nema 17 based extruder

A high-torque standard Nema 17 stepper motor for many 3D printers

This flexible Shaft Coupler is design to mate between 5mm and 8mm shafts.
The clamping type is better as it generates more friction with the shaft being gripped, so much less likely to slip during operation. It also as a set screw, for use on shafts with flat of keyways.

These straight cut gears have the advantage over a hobbed gear in that the profile of the teeth is much deeper - so they dont get clogged as quickly - they get a better grip on the filament for longer.