The springs are used in 3D printers for different reasons, the main one is for elements that require a certain pressure, such as the extruder tensioner. In this way, the tension adapts to the differences of the filament diameter.Also used for items that require adjustment, such as the heatedbed...
Hobbed Bolt for 3D printer, based on Reprap community design: http://reprap.org/wiki/Wade's_Geared_Extruder#The_Hobbed_Bolt M8 x 60mm knurled at a standard meassure, 25mm from the head of the bolt aproximately. This features are adapted to the last versions of Greg's Wade extrud..
Dual P3Steel by HTA3D Nuts and Bolts:Screws: M3x8 - 21 units M3x12 - 69 units M3x16 - 9 units M3x20 - 8 units M3x25 - 12 units M3x30 - 4 units + 1 fully threaded M3x35 - 4 units (with spring and 2 washers) M4x6 - 4 units M4x20 - 3 units M4x2..
WILSON NUTS AND BOLTSComposition: -51x M5x8-51x M5 T Slot Nuts -4x M5 T Slot Nuts (They can be inseted after the mounting)-2x M5 Nuts-7x M4x20 + 7x M4 Nuts-11x M3x10-24x M3x14 (Black and allen)-10x M3x30-18x M3 Nuts ..
Special Hardware Set: 2x M3x40 Partially threated bolts with springsM8x20 setscrew for the extruder idlerM3x10 setscrew small gear2x M5nylon nuts (in black or white) for Z axis. It is a great improvement, as nylon has an excelent abrasion resistance, also provides a s..