Desigining 3d Printer, Crane like Z-Axis (Up) Problem

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hello, i've been wanting make own 3d printer while, , have many doubts things.
i've been reading , researching far, , set electronics, i'm still having problems regarding the
mechanics of machine. i'm student engineering school, i've haven't seen subject related mechanics
yet.

what i've had on mind while right now, design of z-axis of 3d printer. problem itself.
(image in attachments)
i've seen designs of 3d printers, reprap separates rods (y axis) between x-plaftform axis.
what want know is, if design 1 in picture, considerations should take?

does weight matter in case? (in blue circle arrows pointing it) have distribute weight? afect alignment of axis? , strain in stepper motors. affected if it's too? or smooth rods stop happening? material in gray-black color, aluminum.

on reprap, think because of design, weight distributed evenly across axis. i'm not sure.
i know, books or links handle or talk topics this, read them, me lot.
any appreciated. thanks.

looks ormerod type design.

i going build own went down , picked xyz davinci started.

have @ these.

http://www.3ders.org/articles/20131202-reprappro-launches-affordable-ormerod-full-3d-printer-kit.html

http://forums.reprap.org/list.php?340


Arduino Forum > Topics > Robotics (Moderator: fabioc84) > Desigining 3d Printer, Crane like Z-Axis (Up) Problem


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