step 1) purchase a maintenance agreement from your local vendor. step 2) calculate you prices to reflect the increased machine cost. 3) print on a machine that you know is being paid for and that you know someone else is fully responsible for keeping it running.
When negotiating the contract be sure to include penalties for the vendor for extended downtime that will cover your shop expenses - if they are worried they will have something they cannot fix, then maybe you should look for another vendor.... YOU are in the business of printing, THEY are in the business of keeping you printing - make the contract reflect this. - and be aware it may double the machine cost in your pricing, but you will NEVER have to fix it yourself, or if you do you will be getting a payday.