@Ulrich_Baer 15g >> (whatever three M3 set screws weigh). My print head weighs very little, so 15g would be a non-negligible addition.
That is a bit of an unlucky combination, a very lightweight head with cheap rails as normaly weight would minimize your issue. A lightweight head is nice for higher speed but higher speed will increase that problem.
But aslong your solution works …
Does that only happen on the one axis? Maybe it’s just a bad rail car.
@Jeff_DeMaagd my y- and z-axis both have two rails and so, while they also may have bad carriages, it doesn’t show. I wouldn’t be surprised if they all have some amount of play just due to the relatively low quality. One of the rails had over 5mm of curvature in a 250mm lenghth!
@Daryl_Bond If your rails came bent like that from robotdigg, i’d let them know. I had 2 of my 750mm rails come with a bend near the ends that wouldn’t let the cars go up to the end of the rails. They replaced them after i showed them some pictures.
@Jordan_Bourns yeah, I probably should. I don’t think I can be bothered though as it was a large radius bend and fairly easy to straighten, given that it is mounted to a 4mm plate and I could adjust it as I did up the bolts. Its all working fine now.
It must have been pretty bad on your rails that you couldn’t get full travel! I suppose I’m just happy that there is a source for rails that doesn’t break the bank. It’s not like we need unobtanium grade rails for our applications.