A multi-block thermoplastic polyurethanes system which incorporates polyhedral oligomeric silsesquioxane into conventional biodegradable thermoplastic polyurethanes built up by poly and polyethylene glycol blocks, resulting in biostability. The methods include testing the ejectors prior to drop ejection. The first node is configured to wirelessly transmit information for simultaneous, or substantially simultaneous, transfer to the second node over at least two pathways.