Summary

A frame for 5 resistance wires which is a solution for the hot bed.
The second frame is upgraded, it fits better to my Reprap.

Instructions

This is a frame for the hot bed of Mendel Prusa machine. This frame is for 5 resistance wires. Wires are mounted between 2 frames. They are mounted indirectly. You have to use ceramic beads to mount wires in frames. Each frame is mounted by 2 bolts to a wooden plate which is connected with guide bars by bearings as usual.

Reflective material under wires will short the heating time, but mind that your glass can break because of this as i shown on the pictures.

Frame of resistance wire - hot bed