Pen Plotter 1.

I'm not documented this project deeply, step-by-step. Now I'm just writing where am I today with the build. Mainly pictures.
More than three month ago I had a conversation with my son. He told me that he want to build a "drawing machine" essentially a pen plotter together with me. I started to design one. After a few conversation he told me that he wanted to build it from Lego.

I was already too deep in the designing already, so I didn't want to stop. In addition I was planning to add exchangeable head to be able to use it as a light router and a laser cutter/engraver.

I think the design mainly finished:

I left out a few things from the design, like drag chain, screws, spacers, timing belts.

During the design process I already printed some of the parts:

As you can see, there are some assembled parts also on the picture, like the Y axis drive (round white thing in the center) and Z axis carriage (the green thing).
How the Y axis timing belt mount into the holder:

Lots of holes, the base plate:

X axis assembled:

continue...

Cyclone PCB Factory 4.

Started to correct the things from the previous post. Went to two local shops (had no more time), to find M3 grub screws for the steppers. No success.
What if I try to make a few at home.
Here is the setup:

And the result:

I think, not bad for the first try.