Just a datapoint/fyi: applied for ED visa at Vientiane consulate and was required to provide bank statement along with all the other usual documents. My language school had said that I didn’t need a bank statement when applying at consulates in Laos, so I ended up having to print it out from the small print shop in the consulate for 80 THB per page. Hope this helps someone else avoid the expense and headache of printing it out on site.