How I fixed my wobbly bed problems

My first press died after only a few hours when my thermistor shorted and took the mainboard with it. About a month later my replacement press arrived. It had the same improvements as others have noted. The one thing that didn't change is the bed problems. After a large 17 hour print I noticed my bed had a wobble in it due to wear in the plastic bearings from the z rods. It was not just front to back put side to side. It was so bad when it would do the bed probe it looked like an ocean wave. Every time I printed something I got different results, especially on large prints. My short term fix was to hang a 16oz weight on the left side of the bed when it would do the z probe, then remove it before it started printing. My ultimate fix was to weld up a new bed out of 1" aluminum square stock. I probably could of gotten away with something smaller but I already had it on hand. I attached some linear bearings to the back and after about 10 hours of aligning and tweaking I finally have some good results. I tried using just one bearing per side but the movement didn't seem smooth enough. Probably due to the extra weight from the new bed. Using two per side resulted in very smooth Z movement. I also replaced the bed heater with an aluminum plate MK3 heater. It is super flat even after attaching a curvy piece of PEI. I wired it for 12v and am running 24v through it with a 40 amp SSR. I can heat my bed to 110 faster than my extruder heats to 250. I am feeding it with a couple of modified Dell server supplies wired in series. Finally I have good looking prints with repeatable results. My next step will be to replace my z probe switch with a higher quality Omron unit. About one out of ten bed probes the switch doesn't "click" and I will see a section of print with a different amount of "squish".