Summary

Simple mount for a dial indicator to check that the bed is level and if it is warped or not.
Held in place just by gravity and a V-grove to key on to the front gantry rod.
9.5mm hole for the dial indicator.
Good for 40 to 50mm rod spacing

Carefull not to push down on the dial as your taking a reading as the gantry rods will bend slightly at the slightest pressure throwing off the reading.

If printed in ABS it should have a good friction fit for the 9.5mm shank of a dial indicator, if printed in PLA or if the hole is too loose I have Included a nut retention slot and a hole for a ~2.7mm screw. A slightly over sized bolt may not need a nut.

If you have a oddball hole size requirement let me know in the comments and I will see if I can mod it for your dial indicator.

3-1-16: Added 8mm shank version.