10x20 Chain Connector Extruder CTC Prusa DIY

I've made these to fit a 10x20 drag chain to my CTC Prusa i3 DIY. [Like this one](https://www.amazon.de/gp/product/B00KBPQIBE/?tag=tv-auto-20)

My main goals were:
- to not have to print printer parts again with a chain end on them
- not to lose printer space on any axis
- no 'wobbely' parts

It goes up to Y=189 (if I remove the top left CTC badge because it's screws are in the way).

You can use as few as 20 chain elements (though one or two more won't hurt).

You need 2 M3x25 or lon