Dial Indicator Mount Prusa MK2 - modified

some modification on the original design by slayer1551:
https://www.thingiverse.com/thing:2308978

I liked the original design idea, but wanted it to be a bit different, namely:
1. turn the dial to face the front (!!)
2. center the hanging beam (which for some reason was offset)
3. reduce the hanging beam length - saving material, printing time and reducing torque on the print head
4. added some chamfer on the protruding tabs and on one side below for easier extraction from PEI print area