Going on a business trip tomorrow for 10 days. Taking a little maker spirit with me. What else should I take, there still space available in my wallet
That’s nice 
I like it. You need a mini toolkit or one of those cool EDC credit card tools. Then you can Macguyver stuff while you’re away.
Take a Arduino Nano with Grbl on and LaserWer4 on your notebook, so you don’t miss your toys too much 
@cprezzi great idea, i do have one, never thought about that. Are you planing on releasing something coooool?
is there a special version of the fiel or procedure to flash it?
No special installation needed. Just normal Grbl 1.1f installed through Arduino IDE as described on https://github.com/gnea/grbl/wiki/Flashing-Grbl-to-an-Arduino
Any naked Nano is good for machine simulation.