I'm trying to build some motorised tools for video production using professional video cameras, RED camera etc. think 5-10kg in weight. Everything has to be really precise with little to no wobble or backlash. I've been looking into this for a while and would love some advice on a few points. FYI, I have looked through all the forum posts but there's nothing that answers my questions. I'd like the rig to be able to move vertically and even inverted if possible, although inverted is less important. I was originally looking at the 500mm Openbuilds linear actuator - C-Beam® XLarge Linear Actuator Bundle - I then had a chat with someone at Igus who said using a screw could cause a wobbling movement and that a belt driven system would be much better. Screw would definitely provide more torque but it's useless to me if there is any wobble. 1) Could there be wobble on the Openbuilds linear actuator if the slider is only 500mm long? I can understand the wobble being an issue with longer sliders but I'd hope it wouldn't be a problem on shorter units. 2) Would the Openbuilds system be safe running vertically and even inverted? I was thinking of using some extra wheels on the inside to help with stability. This is very important as camera equipment is stupidly expensive and my worst nightmare would be for the carriage to come off the slider in either a vertical or inverted setup. The guy at Igus suggested the Toothed belt axis size 1040 with a Nema 23 XL which will give better torque. I want to get the right thing but that will be quite costly. drylin® E electric linear axes and linear drives with motor What does everyone think? Igus or Openbuilds for the slider? Next, I'd like to build a rotation device but I'll start a new thread for that so things don't get confused. Any help would be much appreciated!