Hi all,
looking for ideas regarding x axis travel methods.

for my y axis I have two steel plates on the outside of my chassis...
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On these I have built two carriages that run smoothly and will be driven by toothed belt on each end.

once the gantry is bolted to the carriages, I need to make some sort of transport for the z axis to ride on but not sure of the most cost effective way to do it. Stuff like HiWin track is way over budget.

any ideas on a good choice?