i'm about to start designing the next prototype of my 300*300*350mm corexy 3d printer

3D Printing
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1

i’m about to start designing the next prototype of my 300300350mm corexy 3d printer build but i’m in a bit of dilemma: since the bed is bigger than usual
i can’t use the cantilever z axis design , i’m thinking of

-dual z axis with 2x t8 lead-screws and 4x 12 mm steel rod & lm12luu bearings

tri lead-screw(2 at front edges and 1 at back center) with 3 t8 leadscrew , all driven by a single motor with belts & pulleys and 4x 12mm steel rods(1 with the front leadscrews each and 2 with back leadscrew)

what do you think is best? will i over-constrain the z axis? or do you have any suggestions?

BTW my current prototype has slight z banding in no particular order, it is a dual z axis but one of the leadscrew is slightly bent and i’m using 8mm rods
if i look carefully i can see the bed vibrating when i move the z axis up or down
will replacing the bent leadscrew fix it?

11628d5bb889249ef27e70438759a670.jpeg
11628d5bb889249ef27e70438759a670.jpeg4160×3120 1.27 MB

2

I imagine you will have to have a way of zeroing out any backlash. N lots of adjustments Can mean trouble. And yea I imagine using a straight and balanced shaft will run true.

3

Suggest you have a look at this design.

4

Or this one:

5

I have 300x300x300 core XY my Z axis is on 2 screw and 4 8mm rods. I think this is enough

6

I am currently printing the parts for my Hypercube Evolution: https://www.thingiverse.com/thing:2254103.

300x300x300 mm is the standard size. I build the version with double Z axis. It will have 470 mm build height.