Muriatic Acid Etchant PCB making

hi
This is bet version i recently give it to my friend to testing.
This is i called pcb bath for acid ethant. in general making pcb. this is example instruction:
http://www.lvl1.org/2011/05/03/toner-transfer-and-muriatic-acid-etchant-making-pcbs-at-lvl1/

print with ABS i recommend vapor bath for air tight.
the middle part is for acid the rest for hot water to make temperature higher.
to make it work you have to put 3 pices of clear acrylic 10 cm wide and glue it with for example sil