23/02/11 Update: didn't realise the wades holes are offset from the filament hole, just fixed that. Got my prototype to work anyway by drilling wades holes into slots.Also you can see in the photo i've made it big enough to fit a small fan on the back although it mightn't fit there on the mendel. The fan shouldn't be necessary unless you're extruding in hot climates with no aircon.-UNTESTED-i got this lasercut in 5mm clear acrylic.I fed the wires through the holes, soldered them to the screw terminals then pushed it down into the holes and it stayed put. If it doesn't stay put you may want to leave a little section of the butchers paper stuff there so that you can superglue the screw terminal to it, (the glue may not stick to the acrylic)depending on the thickness of your heater block, you might want to wait until after you have screwed your heater block on then put this on and bolt it up, then wire up the heater block.if you put it on before screwing on the heater block, the rectangular shape of it it might butt into the converter plate as it screws up, the acrylic is pretty thick but the gap is big enough for a large heater block to sit in if it's positioned right. If it's already screwed on you can adjust the heater block so it won't be touching the acrylic, then slide the plate over and bolt it up.