print in the orientation shown in the cura picure (yellow) at 10% grid infill - no support is required
this clock mount can be taken on and off without cracking, which is the main issue i found with the other design on here using this clock.
the clock that this is designed for can be found on sites such as ebay and the like for about £3
the clock and mount are a tight fit on purpose, the whole unit can be removed from the handle bars easily enough if neccessary. if you do want to be able to easily remove the clock for whatever reason, the clocks are trapezium shaped ever so slightly, file the wider parts of the trapezium off untill it is rectangular again
any questions or feedback, feel free to post a comment or mesage me
the clock used is available, have a little look yourself, may be able to find it cheaper elsewhere