Ralph, it hasn’t eliminated my scratch-building, just enhanced the heck out of it. Case in point, I built an overhead gantry crane (non-operating) for a large O’scale engine house on my train layout. The crane chases was built old-school out of styrene, the railing was a three-layer, laser cut laminate and the hoist apparatus and trucks were 3D printed. This was one of my earliest projects.
I found the gantry drawing on the SketchUp 3D Warehouse and modified it many ways to fit my space. I first had the hoist 3D printed by Shapeways, but it was too big and at the same time, my 3D printer arrived in June 2019 so I printed my own.
Since then I’ve printed thousands of parts. Just today I’m painting about 120 small angle brackets with bolt details for a bourbon warehouse (rick house) under construction of the same model railroad. This is definitely old school with lots of scale lumber, but the angle bracket which I drew and then printed have saved me lots of time.
All it took was one drawing, the slicer lets you step and repeat the objects so i was able to print 60 per load. Each took 25 minutes plus post cleaning. I had to do some very minor sanding, but in two days I had 120 of them.
And yes… I could have made them with some styrene angle and NBW castings, and it would have driven me nuts.