These are clamps for mounting power supply in a Prusa i2
thingiverse
The mount system is designed for use with a switching power supply, such as this 50mm thick model: http://bit.ly/18XYyUx. It comprises three brackets securely fastened to threaded holes in the power supply. Numerous Chinese power supplies share this design. To install, you'll need three M4x10 bolts (longer ones may work but could potentially touch internal components).
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