RE: Free advice from lawyers?
I am not sure about US laws but for British style law you cannot contract out of such legal liabilities esp when you are a 'manufacturer', does not matter for profit or not. The DISCLAIMER that you wish to use is so broad, it means even if you were negligent there is no liability on your part. You can still be liable for tort (not contract as you said you are not selling for profit, again when you sell at cost it can be contractual too!).
US laws are pretty strict, more than British ... read that is used by US companies, its usually not liable if used in an unauthorised manner etc. Its not a 'You buy, I no liability'. Best to seek a friend who is a lawyer and ask for some free advice, this is chicken feed and free advice of this sort is openly dispensed. I used to all the time when I was an attorney.