I purchased the hardware kit for the lowrider v4. I accidentally slide the carriage off one of the linear rails and lost some bearings. The rails are sold out in the store and I cannot find the LDO model for sale anywhere else online - is there a recommended model of carriage/replacement rail? Can I just replace the lost bearings?
Thank you!
Yes you can get new bearing. Carefully measure one of the bearing. Diameter is all you need. Search for Bearing Balls 304 Stainess.
I do not have a precision scale or caliper, is there some other way to measure?
If you go to the parts list, you can find a link for it: LowRider CNC V4 - V1 Engineering Documentation
checking around I found a note about the bearing balls being 2.38 mm or 3/32 inch. If you have some of the balls still, you can line them up in a row. 32 of them will be 3 inch/23.3 mm. or 16 of them will be 1 1/2 ’ or 38.1 mm. You will have a pretty good measure with a standard ruler or tape.
There’s massive variability. You might be able to measure/buy, but if it were me (and it has been me 
) I’d buy another rail.
If you balance out the amount of balls in both sides does the slide still work well? I have found I can lose a bunch and have no noticeable effect.
Magnet the floor, on the vacuum or broom?
First, thank you all for your responses. I’ve been going over my space with a magnet and have been able to recover all but 2-4 per side. It seems to move fine but its not quite as smooth as the rail with all the bearings. Any advice or thoughts on how to judge if it’s “good enough”? I am not opposed to buying a new carriage, I am just new to this and really not sure how to judge.
Missing 2-4 should be fine for sure, I have 100% run with far more missing. You can lube them, and loosen the end caps a little and give them a firm roll and snug them back up that should smooth things out.
Heh, my old 3d printer was missing half a dozen of them on a z and had no effect to print quality. 