Coupling

Polymer Couplings

In several cases a sort of plastic tube have been used as a coupling between the motor shaft and the threaded rod.

from RepRapPro_Mendel_z_axis_assembly

• aquarium tubing
  • silicone tubing 4mm inner diam. - 6mm outer diam. (e.g.: [4])
  • polyurethane tubing (e.g.: [5])
  • pvc
• heatshrink tubing 3:1 ratio (12mm to 4mm) with adhesive ([6])
• vinyl end cap from hobby rc cars 4mm inner diam. - 10mm outer diam. - 22mm long

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As mentioned in this thread : http://forums.reprap.org/read.php?283,151801,151801

Link	From	Size (ID-ID)	Approximate Cost	Tech	Additional notes
[1] Paoparts	France	5 to 8 mm	10,95 €	helical	-
[2] Paoparts	France	5 to 8 mm	9,10 €	spider	-
[3] Technobots	UK	3-6 to 3-6 mm	-	inline	-
3D Maker World	US	5 to 6.35 mm	$5.00 USD	helical	-
3D Maker World	US	5 to 8 mm	$6.50 USD	spider	-
3dprinterfactory	Australia	5mm > 8mm	$5.20 AU ea-	helical	-
Makemendel	India	5mm to 8mm	$3.99 USD	Flexible	Used in Z axis of 3D Printer.
RobotDigg	China	5to5 and 5to8, other sizes as per request	$1.8 USD	Flexible	Used in Z axis of 3D Printer.