Marblevator, Striker

In this model, I've combined a track similar to that used in my "Marblevator, My Fastest Yet" design with the robot in my "Executive Desktop Toy 2" design to create this model, "Marblevator, Striker". By pressing then quickly releasing the lever on the back side of the robot, an 11mm nylon sphere is propelled around the track and back to the beginning ready to be launched again.

As usual I probably forgot a file or two or who knows what else, so if you have any questions, please do not hesitate to ask as I do make plenty of mistakes.

Designed using Autodesk Fusion 360, sliced using Ultimaker Cura 14.12.1, and 3D printed in PLA on Ultimaker S5s.

I acquired the following part:

1. One 11mm nylon sphere.

I 3D printed the following parts at .15mm layer height, 20% infill, and no supports:

1. One "Arms Axle.stl".
2. One "Arms.stl".
3. One "Axle, Lever.stl".
4. One "Base Tower.stl".
5. One "Base.stl".
6. Two "Bolt (M6 by 1 by 8).stl".
7. Two "Bolt (M8 by 1.25 by 4).stl".
8. Seven "Bolt (M8 by 1.25 by 8).stl".
9. One "Bolt (M8 by 1.25 by 16).stl".
10. One "Bushing Left Armed.stl".
11. One "Bushing Left.stl".
12. One "Bushing Right.stl".
13. One "Head.stl".
14. One "Lever.stl".
15. One "Mallet.stl".
16. One "Robot Torso Left.stl".
17. One "Robot Torso Right.stl".
18. One "Shoulder.stl".
19. One "Spring.stl".
20. One "Track.stl".

This mechanism is a medium precision print and assembly using at times very small precision 3D printed parts in confined spaces with highly precise alignment. Prior to assembly, I test fitted and trimmed, filed, drilled, sanded, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on your slicer, printer, printer settings and the colors you chose, more or less trimming, filing, drilling and/or sanding may be required to successfully recreate this model. I carefully filed all edges that contacted the build plate to make absolutely certain that all build plate "ooze" is removed and that all edges are smooth using small jewelers files and plenty of patience.

This mechanism also uses threaded assembly, so I used a tap and die set (M8 by 1.25, M6 by 1) as required for thread cleaning.

To assemble the robot, I performed the following steps:

1. Positioned "Spring.stl" into "Base Tower.stl" and secured in place with "Bolt (M8 by 1.25 by 16).stl".
2. Pressed "Bushing Left Armed.stl" and "Bushing Left.stl" onto "Arms Axle.stl" leaving 4mm of the axle exposed outside the left bushing.
3. Pressed the axle assembly into the base tower assembly, through the spring then pressed "Bushing.stl" onto the remaining axle end.
4. Slid the bushing arm arm into the rear slot in "Robot Torso Left.stl" then slid the left bushing into the hole in the left torso.
5. Positioned "Robot Torso Right.stl" onto the assembly.
6. Attached "Head.stl" to "Shoulder.stl" using "Bolt (M8 by 1.25 by 4).stl".
7. Pressed the head and shoulder assembly onto the top of the robot assembly.
8. Glued "Mallet.stl" into "Arms.stl".
9. Carefully spread the arms and slid them over the arms axle.
10. Secured the arms to the arms axle using two "Bolt (M6 by 1 by 8).stl".

For final assembly, I performed the following steps:

1. Attached two "Bolt (M8 by 1.25 by 4).stl" to "Base.stl".
2. Attached "Track.stl" to the base assembly using four "Bolt (M8 by 1.25 by 8).stl".
3. Attached "Lever.stl" to the base assembly using "Axle Lever.stl" making certain the lever rotated with ease.
4. Attached the robot assembly to the base assembly using three "Bolt (M8 by 1.25 by 8).stl".

And that is how I 3D printed and assembled "Marblevator, Striker".

I hope you enjoyed it!