@Tim_Rastall , The current mass of the Extruder carriage (Probably going to be polycarbonate) will be ~80g and the entire gantry would be ~650g. What would the maximum acceleration and speed on such a gantry be?
@Ishaan_Gov I just noticed that you have the top of the Z-axis lead screw constrained. Be careful to not over-constrain it (give it some slop). This will help prevent any straightness issues with it from affecting your bed positioning. Like the design though.
@Eclsnowman Nice tip on the tensioning roller. I will include it on the printer I am building! I like fixing problems before they happen 
@Jason_Barnett , Thanks for the recommendations–The top plate for the leadscrew does have some sliding mounts in it, so they can be adjusted. I can also leave these slightly loose, if it will help
@Ishaan_Gov hard to give you a definitive answer as the mechanical design, shaft lengths, belt length and thickness etc would need to be considered. 650 seems very heavy though. I’d say you need to shoot for 250-300.
@Ishaan_Gov if the lead screws are thick enough constraint at the top should not be an issue. Just make sure the mount has x and y adjustment. I have my 12mm Misumi lead screws constrained without issue.
This is more of an issue with the tiny threaded rod z screws on small printers than with high quality large diameter lead screws.
try out Fusion 360 for modeling, it does renderings in the cloud so you can do hi rez stuff on your laptop
Alright, I have gotten the mass of the X-carriage down to ~350g with some serious mass shaving. I can post pictures in my feed, so I don’t spam up the community