I use the free ones from overture also, I use a paper shear to cut them straight, you can also buy them without the filament on amazon. Get the bigger ones either the 250mm or 300mm square and you can get the most out of them. I used a 200mm one on my V2 and it worked great but I only got one full one and a second two part one. Next time I'm getting the 300mm one

www.amazon.com/gp/product/B082K51B9G/ref=ox_sc_saved_title_6?smid=A3M6OB6YPLO1C&psc=1

for 13.99 for 3 and I should get at least 4 per sheet, so 12 pads for a little more than a dollar apiece