This is small version of my Full Size OTF UB by request. The blade mechanism extends about 30mm from the body to meet law requirements in various regions. (check local laws)
You'll need 1 of each part
1 rubber band
1 Utility Blade like this
Print at .12 layer height or the slot for the spring won't print correctly.
The author remixed this model.
The original model has been greatly modified to hold a utility knife and now its been shrunken down to meet some law requirements in various countries.