Tell us about yourself!
Since you can actually use grass-trimmer line as 3D printing filament, you could make the trimmer out of that for even more lulz!
Rather than replacing the O-rings with the disks, you could just use the disks to support the O-rings. That way you could increase the clamping pressure a lot more because the O-rings would be compressed against the disk rather than popping inside the heat sink. I'm going to give that a try anyway.
High Powered Yellow Bike Light (Front+Side Combo)
Tell your dad that table saws are safer than portable power cutting tools - you always know where the blade is going to be. Great 'ible BTW.
How to Amuse Toddlers