1. You can burn your fingers on stepper motors.
2. My extruder has a problem.

Explanation:
The extruder from Wolfgang is translating many steps into a few powerful ones by using gears.
The problem is that the small gear on the motor’s shaft is only fixed by a small  headless screw
which becomes loose after a while.
This just happened during a very complicated print, which of course went wrong because of it.
Also because I’m not possessing my own set of compatible screw drivers for this kind of screw
I’ll have to wait until my colleague who has this kind of equipment has finished his last exam tomorrow.
Just when it started to be fun printing things… I really have to work on my Karma as it seems.

Now my RepRap really qualifies itself as “self replicating” from which the Rep in RepRap comes from. (Self replicating rapid prototyper)
It just printed spare parts for itself.
Yepee 😀

Today I tried to print thing 27405 from thingiverse (http://www.thingiverse.com/thing:27405) on the PrusaMendel in the CCCZH lab.
The result is shown in the provided image.
After some tweaking of temperatures and speed I finally managed to make it print perfectly!
While bigger objects still are producing some strings when it’s going to the end, smaller objects are printing fine now.
Turning the temperature to 190°C for the first layer and 185°C for all the other layers, and also reducing the extruder multiplier down to 1.0 made all problems go away. Finally!
Now I just have to figure out how to make Slic3r in ReplicatorG do support material.

I actually wasn’t sure if the RepRap wasn’t gonna burn like hell while being left alone printing in the hackerspace but it made it’s job well and printed the whole Hilbert-Knot without any incident.
During my trip to the hackerspace I already had nightmare imaginations of what might have happened to the machine.
I was quite delighted to find out that none of them had happened.
On the contrary: I now even have figured out the optimum feedrates needed to print overhanging objects which are enough dense.
I think I’ll try to print a rainbow dash soon.