jarl72

6 hours ago, Gina said:

I doubt differential expansion will have much affect but there is a bit of stretch in the timing belts.

Yep... I guess with the dT you are more likely to see the expansion will be negligible.

In any case, watch out for overconstraining of any of the axes. On my printer there's a misalignment of at most 1mm over the range of the Z axis, but that was enough to increase friction *a lot* on the igus bushings. I had to loosen a couple of screws to allow some movement. 

Hello Gina,

I'm following your thread with a lot of interest, since I have been planning a similar build for some time.

One question, though: did you leave some built-in "give" to avoid over-constraining your axes? The difference in coefficients of expsinsion between the AL components and the wood frame (in particular given the size) can create some "interesting" issues there.