Update 8/4/2017: Updated Top BB bearing and added new 608 bearing versions for Top and Base. The BB raceway tends to require some post-processing for silky smooth operation. 608 bearing versions are fully interchangable with other section types. Top is further inspired by https://www.thingiverse.com/thing:2035825 with integrated hooks along the edge.
A turntable that can be expanded as needed. 6mm Airsoft BB's (up to 42) are used as ball bearings for free rotation. 4.5mm BB's can also be used but aren't as good. I used a 20mm M3.5 bolt with washer and nut with a bit of loctight to secure the top and base so the bearings don't fall out. Turntable diameters are Top: 108 mm (4.25") and Top Extended: 177 mm (7")
Mix and match pieces as you need but only Top and Base are required. I used crossed toothpicks or Cups in Height Extension and Feet sections to add ballast (lead buckshot in small baggies) for a more stable turntable but ballast isn't required with just one Height Extension and Feet section. The threaded cup can also be used for securing to a platform if you don't want to just drill holes for screws.
Lots of various diameter, location and orientation holes for plugs, toothpics,wires, rods, ect.
Additional tools used in painting: toothpics, rubberbands, pieces of wire for elevation of model, handling and securing pieces for painting, https://www.thingiverse.com/thing:1669403 , https://www.thingiverse.com/thing:2117261
To Do: insert-able domed plugs, angled toothpick plugs, pcb clamp-like wing/thumb screw/ adjustable clamps, articulated arms https://www.thingiverse.com/thing:801279 , toothpick crane arms https://www.thingiverse.com/thing:2111631, redesign for threaded section connecting, improve Top 608 bearing stability (wide base structure/ roller wheels/ )
.4 mm nozzle, .15 mm layer height, 3 shells, 255/100c eSun ABS+, 40c enclosure. Only Top and Height Extension actually need supports for a clean print.
I used TPU for the Foot extension inserts (for more grip)