Dispenser Pen for Solderpaste etc.

Usecase & Idea:
I needed a better solution for dispensing my solder paste than simply using a siringe. After searching the web for buy solutions and searching Thingiverse, i found something interesting, the [Flux and solder paste Dispenser for 1 ml syringe](https://www.thingiverse.com/thing:4675844) from [RovMaker](https://www.thingiverse.com/RovMaker). This was pretty much what i wanted. But after printing it i was rather unsatisfyed, with quite a fiew things. So I obviously had to redesing the whole thing and started completly from scratch because i wanted to use a siringe with the lockable "Luer-Lock" connector and a quick swap mecanism for the cartriges. This is why i don't consider this as a remix cause i didn't used anything but the Idea of a pen with a siringe.

Build:
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