Ezanity

Hi all.i live in the UK and am very new to all this stuff so ill tell you what i want to do with it incase im not understanding what dtg-dgf and whatever all the different names are.lol i want to be able to print direct to any item. slate, wood plastic etc and it will likely be different heights and i don't really want to have a slow process of manually adjusting it when i change to different materials. i do see that there are some here on this site but the conversion of usa to gbp and shipping etc will make it too expensive to buy one directly so if i go this route id need to diy. The only concerning thing is that im ok with diy stuff but cutting up a £800-1000 printer is a worry. as an example of costing, the printer with adjustable bed and just a set of inks costs $4694.98(no software etc) which on a conversion is £3421.70 and that's not including any customs / delivery fees. i have seen this printer on amazon for £2859.00 https://www.amazon.co.uk/gp/product/B087JPXNCL/ref=ox_sc_saved_title_1?smid=A3B1VG3K7MA8HC&psc=1 i would like to be paying less but i don't know if that's possible. I'm not sure what printer the link above uses but i can guaranty it wont be the p600 and prob one of the not so good units so i just dont know if its worth it.please any help would be great. there is a Epson SureColor SC-P600 printer on ebay that claims to be in good condition but not used in 14 months for a lot less on bids but would it be worth me going for something like that cause when i read stuff like that ,it always makes me feel like they know its not working and just saying that to encourage more bids. are print heads expensive for the p600? Also on a side question.-- so lets say i wanna print to 2 phone cases,how do i know where it will need to be placed on the bed so it matches up correctly.(or if you know any good videos that will teach me the basics of uv flat bed that will be great) Thanks all dom