Printer Customisation

Take a look at the smartcore printer project
Open in Jscad and you can customize as you like

https://www.youmagine.com/designs/smartcore

The stepper motor size is based on the mass to be moves and the fastest moves it makes. 
http://www.geckodrive.com/media/wysiwyg … 0Guide.pdf

You can also use a more generic board and install marlin if you are building from scratch.

remember the laws of scaling area is proportional to the square and volume proportional to the cube

a printer with a 500x500 build plat is 16 times the size of my sd4 with a 200mm cube build area. the heat bed will require over 6 times the power.

Tin

you will need two z axis motors . you will need to support the bed for two sides'

hello everyone thanks for your reply's. I am done with the designing part and have somewhat completed my build and was testing the z axis with some combinations like--
1. Lifting the z axis with two motors placed at center ,as this will not require any timing belt, and supporting the gantry with four 10mm smooth rods at the corners(refer picture- With two motors). But it didn't work well as while lifting the XY Gantry up and down there was no equal displacement of the gantry, i.e at one side it was higher while on the other side it was low. Even after adjusting the height of the four ends I get the same error and it was not constant value like sometimes there was 2mm height difference and sometimes less, because if that height difference was constant I could have adjusted my bed to counter that deviation.

2. Then I tried using 1 motor and 4 lead screw connected through timing belts (refer pic- With one  motor and timing belt), I must say had a hard time finding the 3meter closed loop belt but didn't find then came accross some experimental videos on youtube and somehow joined the two ends of the belts, but when I tested it to lift the z axis it get struck at some places during upward motion however during down motion it was running smooth. I think there might be some issue with the rods alignment but don't know how I can correct that. Is there's any way to corect this issue?
Thanks in advance

This looks really similar to the printer frame I have been constructing from an old bed frame's angle iron. You're a lot further along in figuring out the motion aspects. Will follow with interest.

I am using 4 10mm smooth rods at the four corners and my xy gantry and lead screws are of 8mm diameter. I think there might be an issue with the lead screw as it wobble alot during the motion, I am using 2 start lead screw as I had hard time finding the 4 start lead screw of length higher than 500mm.

He is using  10 mm rods .
IMHO should still measure for flex. if he can .
The span is over doubles but the cross sectional area is only increased by 1.56 . I am thinking they will be flex and sag.
The other question is load is this set up for a single bowden feed, a double bowden a single direct/double direct and what motors are planned. IE what load does the x rods need to support. ?