Regarding cost-effectiveness for business, everything you need to consider every expense, but I lack the experience to help.
Non-enclosure printers seem ideal, as you can also dilute the enclosure costs with a custom solution for all the printers. As the A1 may not fit in tour plans, you can solve the clogging issues by removing the door and cover of the P1S and X1C; however, maintenance may be challenging. At 250$ an hour, it may be adequate to go with simple and swift maintenance and, whenever possible, replace the component (I would be glad to receive the old ones 
).
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