Step by step…for now i think its OK
2 alim. ? Any reason in particular?
I dont understand??
Why two power supplies? One for the electronics and nozzle, one for the bed?
Aa…yes,one is to weak,i am using a lot of power. X and y axis are driven by external tb6600 drivers,bed is also big and heavy. Il drive motors with one psu,and everything else with another. I am using external toshiba drivers on few my printers and i am really satisfied with power they can give. Speeds are really high,unreachable with small pololu drivers…both psu are 24V 350W
Personally, I’d have gone with a big 12V computer power supply, but that’s partially a matter of the electrical wiring laws in Australia. The 240V AC wiring for the PSU can’t legally be done without an electrical licence. Plus, ATX power supplies can’t be beaten on price per watt.
Amps double using 12v - all of the wiring has to be a heavier gauge to handle the current. A lot of folks with large print beds have started using 120vac for heatbeds because of power requirements…
@Michael_Vaughan Seriously? Need an electrical license to handle 240 even for hobby? that’s though!
@Michael_Vaughan unless your printer is wired directly into the mains(aka, ‘fixed wiring’), aussie wiring laws let you work on mains. In most states making up an extension cord is quite fine, for example. If you want to be really paranoid, when it’s finished, just get it test-and-tagged before taking it to school/work/etc.
You can’t legally change a light globe in QLD without a sparkie licence, but if it’s /after/ the socket, it’s quite fine.
This however seems to change depending on state.
Well,i am not an aussie,and here matters only POWERR. So 12V is not an option. 
@Kristijan_kolak Hi, what will be the bed size? And what sort of Electronics are you using?
@Electra_Flarefire incorrect. Aussie law requires a full sparky license for almost any 240V cabling, whether it be fixed or flex(ie extension cords or appliance cables).
The only exception is for restricted electrical license holders who can do disconnect reconnect, or like for like replacements in the course of their normal employment.
In saying that, I feel completely comfortable and safe doing my own screw terminal connections to power supplies and the like as I have no plans to sell any equipment I assemble or repair.
@Selvakumaran_Ganesan for now i am using 300 x 200 mm heated bed, butit can be bigger, 350 x 250 is max. printer is designed for dual extruder, so i have extra travel, but i have figured that i dont need dual extruder, so i have purchased e3d v6, and chimera goes to my wifes printer. build height is 250 mm.
i am using rambo electronics with external drivers for x and y axis, connected via headers for additional drivers, and changed pinout in firmware, so i have “bypassed” original drivers.
@Kristijan_kolak Use of external drivers is to increase the print speed? Or any particular reason?
@Selvakumaran_Ganesan Yes, print speeds are much higher, its like supercharger -and tb6600 are much quieter, you can not hear them @3 amps. i will make a video when finished. you can see on my youtube channel with printers-i always have toshiba drivers, they are great imho
Thats great… What is the cost difference between TB6600 and the usual 3d printer stepper drivers (A4988 or DRV8825). And what speed do you plan to achieve with good quality?
Tb6600 is about 15 usd/pc. Speeds for printing about 60 mm/sec, fast moves about 300,acceleration 5000.
That settings are usual for me. It could go faster,but quality isnt great
If I am correct, then 60mm/sec can be achieved with either A4988 or DRV8825 (Combined with E3d V6) itself, isnt? . Already you are using All-in-one board ‘Rambo’, this means that in-built 5nos. of A4988 drivers are of no usage?
I thought you might be go upto 100-120mm/s with that TB660 (also maintaining the quality).
One big mistake is nit mention acceleration settings. If you set acceleration to 500 than you can print with speeds up to 400 mm/sec,but printer will never reach that speeds…