Making your diagrams look neat with this set of symbols // Schablone für etwas sauberere Diagramme. 

Incuding a cute little handgrip, which increases usability // der kleine Handgriff beschleunigt das Arbeiten immens!  

Printed with 0.2-nozzle and 0.1 layerheight

The second photo shows the iterations - from left to right:

Version 0.1 

• basic shapes. 
• the small rhombus ist designed to draw arrow-heads.

Version 0.2: 

• aligned basic symbols to the center, streamlining drawing-process
• adding a bevel, which improves guidance of the pen
• adding an “actor”-symbol
• trying to optimize the arrow-heads (not there yet ..)

Version 0.3:

• doing away with the 30°-angle (rarely used)
• the bottom-corner of the 45°-angle marks the center of the symbols, so one can align the ruler quickly
• optimized the actor-symbol (lines were too thin for most pens)
• optimized the grip
• optimized the bevels (Tinkercad missed out on this one, so I did them in Fusion360) 
• added hexagon-shape
• trying to optimize the arrow-heads (the star top-center, still not there …)

Version 1.0:

• same as 0.3, but printed in better quality