There are actually 4 reasons to send money.
1. To pay the invoice for the machine(s) and consumables.
2. To add consumables.
3. To donate for machines for Bob and/or Sean.
4. For the warranty machine fund.
Everything except the initial invoice should be a separate PayPal payment with an attached note saying what it is for, so the funds go to the right pile. I suppose you could send one payment with a note of how to apportion the funds between different needs. I am seriously considering sending some for extended warranty.
I seriously suggest that anyone who has been invoiced, and decided not to participate, notifies Sean, so others can take the slot.
And for those who didn't get in on the deal, if it was me, I would make application as directed on page 1, in hopes of getting one. I don't know if Sean can add units to the list for an additional cost, or not. Don't know if he even wants to, if he could.
Bill