A bit of bit organization was the theme for the day.  Customized tool storage is one of my favorite personal applications for 3D printing.  The two holders on the left have narrow column spacing to maximize density and wide row spacing to facilitate finger access.  The one on the right was design specifically for the nut driver set taking into account the individual size of each bit.  I spent less than an hour designing all three of these bit holders and am sure that investment will pay dividends over a lifetime of quick access to the tools I need.  Pictured below is a CAD view from the underside.  The holders are designed to use a minimum of material and to prevent wood dust from accumulating at the bottom of each cavity.

Little surprise that I have designed and 3D printed yet another tripod to add to my collection.  This small tabletop model is constructed of 5 plastic components and uses a single cap bolt to simultaneously capture the leg pivots and secure the ball head to the apex.  The legs have positive stops for both the open and closed positions. 

Jeanine and I enjoyed a nice walk along a recently opened section of the Bruce Freeman Rail Trail which passes near our home. We turned around at Concord Junction (memorialized by the installation pictured above) where 120 trains a day would pass during the time of the Industrial Revolution.  Quite a stark contrast to today. Now, one of the intersecting lines has been turned into a 25-mile linear park open for all but motorized activities.  We crossed over the Assabet River on a newly constructed pedestrian bridge which reflects the railroad heritage of the trail .  We are very lucky to live in a place with such easy access to nature and a commitment to historical preservation.