Update 11 Jan 2017
Added a set with a lower profile. The original dampeners raised the bed about 17mm. This set raises the printer just 12.5mm for those using a lack table as a cabinet. Download the lower profile ones:
a) bbDdamper_v3FrontBackSetWithHolesResized.75.stl
b) bbDamper_v3CentreSetResized.75.stl

You will of course need to print 4 X b & 2 X a.

I always thought my Geeetech printer was silent, with just some background & fan noise.
Then I watched this video by the 3D Printing Nerd where at the end he adds some dampeners he printed to the Original Prusa i3 MK2 and suddenly it was all quiet.
https://www.youtube.com/watch?v=luhe4Nm8g-w

I downloaded the dampeners and printed one and tested it and suddenly my printer went all silent. Wow!! The original did not fit my Geeetech however so I imported the model into Sketchup and made my mods so that it would fit without moving about.
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There are 2 sets - 1 for the Front/Rear and the other for the Central support.
I printed these, fitted them and the only sound from a metre away was the whine of the fan thru the blower. The printer was very very silent.

If you thought your printer was silent, print a set of these, fit them and then you will know what silent is. My thanks to lazzymonk, who designed the original.