Greolt, thanks for idea, here my replies to them.
1) Mounting the table lift belt will indeed be quite hard. I don't see however how I would get it below the chamber because that would mean I would have to go below the table top (the brown is a 38mm thick MDF tabletop).
I do expect however that once I mounted this, it won't need a lot of servicing, since this is 15mm wide polyurethane T5 belt with steel reinforcements.
2) The space for the laser is indeed quite big, but that also has its purposes. First of all I want space to go upto 80Watt laser tube. Secondly, in the lower chamber below the actual laser there is place for the electronics, suction system + water cooling system which will all be internal, so that space will surely be used
3) About the pulleys. These are T5 pulleys. 20 tooth on the X axis with a direct 8mm mount to stepper motor shaft.
20 tooth T5 = 100mm for 1 rotation. The motor is 200 steps 3.1Nm and in 1/25th microstepping (plenty of power and running very smoothly) this gives me a resolution of 100 / 200 / 25 = 0.02mm (1/1270 ") I think that that is plenty for a lasercutter. HPGL PLT files even have only a resolution of 0.025mm (1/40th mm)
On the Y axis I couldn't go with 20 teeth pulleys, because I use taperlock mounting method. These ar here 40 teeth pulleys, so
at 1/25th step they give me a 200/200/25 = 0.04mm (1/635") resolution and normally I should be able to force this motor in 1/50th step because the 3.1Nm motor is very powerfull and speed on this Y axis is relatively lower then on the X axis. So resolution would then be 0.02mm in both X and Y
For Z axis the leadscrew is 20x4, so 4mm per rotation. Even with the stepper in half step mode there I get 4mm / 200 / 2 = 0.01mm resolution, so I don't see any problems there.
So to rephrase. I understand your point about the difficult to mount table lift belt. I don't see a direct solution to it however since I cannot make 20mm holes in this alu extrusion or I'll loose all of its power.