I'm looking to make a desktop fixed gantry machine with a working envelope of 12" x 12" and maybe 4" in the Z. I'll be doing mostly wood/plastic but will probably occasionally mill some PCBs and some light aluminum work too. I see on the bay that there are kits that come with sbr16 rails and 1605 ballscrews for all three axis and all the extras. The price on these are pretty attractive and it seems they will make putting a machine together pretty straight forward. And yeah I know they aren't going to be 0.001" accurate over the length of their run. I'm just curious how the linear rails will hold up to saw dust... and the ballscrews too I suppose. Any maintenance issued vs the acme drive stuff or the skate bearing linear bearings?