Bed Weight and Lifting Capacity

Motors advertised at 84 oz in or 5.25 in lb
with 1/2 diameter pulley, that is about 20 lb driver force - about right.
Total lift is 40 lb from both sides
Weight of bed - 7.5 lb for top and bottom, 3.5 lb for sides. Rods - .7 lb per foot, we have 3 feet - 2 lb more. Insulation - maybe 1.4 lb / cu ft [1]. We have 1/6 cubic foot, so only a quarter pounder of fluff.
Bed volume of 1440 cu in, is 25 lb of max plastic mass that can be printed.
Thus, if steppers can hold 25 additional lb, that would suffice for any print whatsoever. Let's test.

D3D v20.04 Calculations