Print and Prepare the Parts. I printed the following parts at .15mm layer height: 1) Four "Bolt, Frame.stl", 100% infill, Magenta PLA. 2) One "Frame, Left.stl", 50% infill, Black Tough PLA. 3) One "Frame, Right.stl", 50% infill, Black Tough PLA. 4) Three "Gear, Idler (50, 1.12).stl", 20% infill, Magenta PLA. 5) One "Gear, Pawl (50, 1.12).stl", 20% infill, Magenta PLA. 6) One "Knob and Axle.stl", 100% infill, Magenta PLA. 7) One "Pawl.stl", 100% infill, Black Tough PLA. 8) One "Spring.stl", 100% infill, Black Tough PLA. 9) Two "Wrench.stl", 20% infill, Magenta PLA. Prior to assembly, I test fit and trimmed, filed, sanded, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. If you decide to make your own PLA Spring Motor Demonstrator 2, depending on the colors you chose, your printer model and your printer settings, more or less trimming, filing and/or sanding may be required. I carefully filed all edges that contacted the build plate to make absolutely certain that all build plate "ooze" was removed and that all edges were smooth. I used small jewelers files and plenty of patience to perform this step. I also used 6mm by 1 right hand threaded taps and dies to prepare the threaded parts prior to assembly. Assemble the Spring Motor. To assemble the spring motor, I performed the following steps: 1) Place "Knob and Axle.stl" into "Frame, Right.stl". 2) Press "Spring.stl" onto "Knob and Axle.stl" while placing the spring retainer over the axle on "Frame, Right.stl". 3) Press "Pawl.stl" onto "Knob and Axle.stl". 4) Place "Gear, Pawl.stl" onto "Pawl.stl". 5) Place the first "Gear, Idler (50, 1.12).stl" onto the axle on "Frame, Right.stl". 6) Place the second "Gear, Idler (50, 1.12).stl" onto "Knob and Axle.stl". 7) Place the third "Gear, Idler (50, 1.12).stl" onto the axle on "Frame, Right.stl". 8) Place "Frame, Left.stl" onto the spring motor assembly. 9) Secured "Frame, Left.stl" to the spring motor assembly using two "Bolt, Frame.stl". Final Assembly. For the final assembly, I performed the following steps: 1) Installed two "Bolt, Frame.stl" into "Frame, Right.stl". 2) Secured one "Wrench.stl" onto "Frame, Right.stl" using double sided tape. 3) Secured the remaining "Wrench.stl" onto "Frame, Left.stl" using double sided tape. And that is how I printed and assembled PLA Spring Motor Demonstrator 2. Hope you enjoy it!