This is a set of Wood Working Machinery in HO Scale, consisting of Table Saw, A Radial Arm Saw. A Drill Press, a Jointer, a Planer and a Lathe.
In addition this set has a workbench which is shown in a separate pictures. The workbench has been soaked for 10 minutes in acetone to clean it and make the details show.
The photos of the unpainted models are of the current design before some small improvements. I added handles to the drill press. They are larger in diameter than scale, but can be cut off and replaced with wire it desired.
They should be cleaned, maybe by soaking in acetone for 20 minutes, then fully rinsed, before painting. HOWEVER, read the cautions on the bottle. White Vinegar also seems to work. Some careful cleaning may be needed, similar to removal of flash from an injection molded item. Both acrylic and enamel paints should work, and I have used everything from $1 craft acrylics to expensive paints with success, at least to the limits of my mediocre painting ability.
The photo of the painted model is of a prior design, and there may be minor differences from the model delivered. The unpainted models show the current design, and the current design includes more models than shown in that photo.
The arrive unpainted and connected by sprues. They should be separated by carefully cutting the sprues with a quality cutter.
For more information on my use of the 3D printing process for HO scale railroading and links explaining cleaning and painting models go to Dave's Model Railway Stuff.