I am cutting 0.050" UHMW with dies that are roughly 12"x12" and made a DIY press out of steel and a 20ton jack (pneumatically operated). It cuts though the plastic just fine, but the resulting puzzle pieces don't fit together very well. I am thinking that it must be stretching the plastic since the air jack is so slow. Do most presses rely on velocity for their cutting? Any ideas on ways around this in a DIY setting or am I destined to purchase a $7000 clicker press? Thanks!