ouch, if it were mine, id have to remake the part to sleep at night. WO 4 causes alot of stress, on top of that drilling also does. WO 4 can crack acrylic easy if given the chance to but it was def the combo of the 2 cause look at how its fanned out around the drill hole.
Are you using an acrylic drill bit? Normal bits do alot of damage which might be responsible.
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