Kryptonite Mini-U-Lock mount for Mercier Nano Mini-Velo

This is a mounting plate specifically for carrying a Kryptonite Keeper Mini-6 U-lock on a Mercier Nano Mini-Velo bicycle.  This print works with (and requires) a 12" Voile nano-series strap to secure the lock.

The plate installs using the rear rack-mount bolts on the bicycle's seat stays.  When the lock is hung around the seat-tube, the plate protects the seat stays from abrasion, and has a small ledge to hold the crossbar of the lock in place.  With the addition of a small voile strap, the lock is held securely, and doesn't move or rattle, even while biking over rough dirt, gravel, and rock roads.  Since the plate isn't supporting the weight of the lock, just keeping it from bouncing, swinging, or creeping up on the seat post, even a PLA prototype held up fine in outdoor use for a year, although I would recommend printing in PET-G or stronger filament for long term durability.

The mounting plate should be printed standing up on it's bottom end.  Supports are only required at the edge of the protruding shelf and at the top of the bits that wrap around the rack-mounting-lugs; the voile strap slots and the bolt holes work fine with bridging.

To install the plate, remove the rear rack-mount bolts and washers, place the plate over the lugs, and re-install the bolts.  Then, thread the voile strap through the three slots on the back of the plate (behind the seat stays), so it can wrap around the plate and secure the lock.  (A small button inside the center slot goes into a hole on the strap, preventing it from sliding during use.)  Wrap a small piece of leftover handlebar tape around the top of the seat-tube between the top tube and the seat-post clamp (securing the loop to itself with a dab of glue) to keep the lock from rubbing on and abrading the paint there.

To use the plate, lock the U-lock around the seat tube (and around/under the rear brake cable), with the crossbar facing downwards.  The crossbar should hang below the securing ledge on the plate, and the voile strap can be wrapped around and buckled to secure it in place.  Unlocking the lock or undoing the strap will allow it to be removed.