I've built a couple hundred cages now in expanded PVC. Most in 1/4", but some in 1/2". The 1/2" cages are obviously sturdier. But they are also double the weight and double the cost. And IMO not really worth the extra money. If the cage is built properly then the weakest spot of the cage will always be the opening window regardless if its built in 1/4" or 1/2". Most comedcial cages are built in 1/4" material so simple math tells me that 1000's of snakes, if not 100000's of snakes are being housed in 1/4" PVC shells. And I have yet to hear even one story of someone's pet snake pushing through the end of a well built cage.
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