This would be your most convenient and least expensive option as glass usually runs between 3 10 per sheet with custom cutting.
Glass sheet for wanhao i3.
100 borosilicate glass content.
A sheet of printbite from oozenest also available from.
I got borosilicate from oozenest and they will cut to size including chamfering the corners however you might not want to do this not because it s a bad product but see below a replacement wanhao magnetic print bed bottom section from wanhao uk.
Plate perfectly matches larger aluminum plates 220x220mm on wanhao duplicator i3 mp maker select anet a8.
Make sure this fits by entering your model number.
The glass build plate simply clips onto the aluminum platform and is easily removal via the binder clips.
3d printer glass bed upgraded borosilicate glass plate w corners cut for monoprice maker select v2 anet a8 a6 wanhao duplicator i3 220x220x3mm with4 glass clips 4 5 out of 5 stars 63 15 99 15.
To print with these materials the extruder temperature must exceed 572 f 300 c whereas the extruder on the wanhao duplicator i3 has a maximum temperature of 500 f 260 c.
Thick 4mm glass plate will not warp or bend under heat.
Sourcing a glass sheet.
219x219mm outer size see attached drawing for details.
Heat resistant borosilicate glass wanhao duplicator i3 monoprice maker select heat resistant borosilicate glass wanhao duplicator i3 monoprice maker select 29 95 20 95 quantity.
A sheet of glass cut to size.