Modular and Adjustable Soldering Station/Soldering Iron Holder

Decided to model and print this soldering iron holder with some opportunity for customization! It uses a modular base piece with arm pieces and optional holders around the base.
You can print any amount of long or short arms and attach them to the stand. 
Included is a sponge holder, a little solder tube holder, and a 6 piece soldering iron tip holder. I haven't printed and tested the tip holder yet so I'm not sure if it 100% works. These parts need to be glued on because they're decently loose in the slot they fit into. 
This model uses M4 screws. Nuts aren't necessary as the screw cuts their own thread but probably improve longevity. 
I printed mine in PLA. Use 0.25mm or smaller for best results!

I am new to 3d modelling so any feedback or improvements are welcome!