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GT2 timing belt components are affordably available due to their ubiquity in 3D
printer designs.  Here are a few commonly available parts from Amazon.  The
specific brands change, so these are described generically:

1. Open GT2 Timing Belt, 5 meters long, 6mm width.  These is a single length of
   timing belt which will need to be cut and spliced to form a loop.

2. Metal Open-End GT2 Timing Belt Clamps, pack of 25.  This are rigid clips to
   crimp and join belt ends.  Only suitable for reciprocating motion, they
   cannot travel around a pulley.

3. GT2 Pulley, 20 teeth, 8mm bore, 6mm width, pack of 5.  Note the large bore size.

4. GT2 Pulley, 20 teeth, 5mm bore, 6mm width, pack of 5.  These fit onto our
   NEMA17 stepper motor shafts.  

5. GT2 Pulley, 16 teeth, 5mm bore, 6mm width, pack of 5.  These fit onto our
   NEMA17 stepper motor shafts.  Replacement part for RepRap and Prusa.

6. GT2 Pulley, 20 Teeth, 4mm bore, 6mm Width, pack of 5.  These fit onto our
   small gearmotors with 4mm shafts.

7. Other easily available pulley sizes include 30, 40 and 60 teeth.



Idler pulleys use related 5 mm or 8 mm shaft and bearing parts.

1. 5mm x 25mm Dowel Pin, pack of 50.  Sold as shelf support pegs, slightly undersize and usable as short shafts.

2. Sleeve bearing, sintered bronze, 5mm ID, 9mm OD, 6mm, length, pack of 10.

3. Flanged ball bearing, 5 mm ID, 13 mm OD, 4 mm W, F695-RS Deep Groove Ball Bearings, pack of 10.

