Can someone please explain this post of woodcollector..?

He seems to have a straight line problem.

https://bitcointalk.org/index.php?topic=877143.msg9687095#msg9687095

Hi guys, It seems i have been able to find the answer to all my other problems through Bitcoin and its community so here goes another attempt.

I am looking to have a laser engraver engineered that does not suffer from the "straight line" problem.

The straight line problem can be better understood by watching this video

Buying and off the shelf laser engraver means i could only engrave things that are round which have a perfectly straight line to write on, So something like a vase which has curves cannot be engraved as the laser is out of focus on any part of the vase that is not on the focus line.

I would be willing to offer a negotiable fee or bounty to anyone who could solve this engineering problem. You would not need to build the actual machine. Just provide engineering documents and a parts list so i could build it DIY style.

Thanks