Many thanks for the design, the printing took a while, but it’s worth.
My mpcnc is 90x80cm, has 25mm stainless steel tubes and uses a Makita router driven by Estlcam.
I’m able to mill almuminium, not very fast, strictly speaking, very slow, but it works.
With my 3d printer I had always troubles with overheated stepper drivers, so I decided to build an air tunnel to active cool them.
The bed is made of 12mm MDF, except the top plate which is 19mm. I added a lot of Screw-in sleeves (every 10cm).
I also built in an USB socket and a power socket for the router, and an emergency stop button (which also stops the router)
It’s a 3mm bit. Milling aluminium works, but maybe I had too high expectations depending the speed. I went to a technical collage (decades ago) and there we milled steel at really high speeds, but of course the mpcnc can’t be compared with those machines.
Nevertheless I’m happy with my build, wood works like a charm, and while milling aluminium I have enough time to read Sten Nadolnys “The Discovery of Slowness”
I think used Estlcam with the following settings:
3mm milling diameter
Z+ 1.5mm
F(xy) 6mm/s
F(z) 2mm/s
25% stepover
3% trochodial step length
50% trochodial width
0.05mm trochodial oscillation
Makita router with #2 speed (could be 12000rpm or so)