PLA / PVA Spring Motor Demonstrator

A remake of my earlier PLA Spring Motor Demonstrator, this time printed fully assembled!

Gadget

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Attribution

http://www.thingiverse.com/thing:402412

Description

From time to time and for various reasons, I revisit older designs. This thing, the PLA / PVA Spring Motor Demonstrator, is a revisit and redesign of my original PLA Spring Motor Demonstrator here: http://www.thingiverse.com/thing:402412.

Yes, the redesigned version is smaller, and is only printed in one color, however, the most important feature is that it was printed in place and fully assembled, using PLA for the structure and water soluble PVA for supports. When printing is complete, just throw it into a water bath for a few hours and it's ready to run, no assembly required!

While I had heard of dual extrusion printers before, I had never heard of PVA until I saw the release of the Ultimaker 3 (I must lead a "sheltered" 3D printing life...). After many discussions with the wife, and the onset of Christmas, I received an Ultimaker 3 Extended which included the PVA filament. I am not a fan of PLA "supports" as they tend to leave a rough surface at the point of contact with the component being printed. However, the Cura slicer and Ultimaker have solved this with the use of PVA supports, as the point of contact surfaces are remarkably smooth leaving no visual hint that support was used.

The first photograph shows from left to right, the original PLA Spring Motor Demonstrator, the redesigned PLA / PVA Spring Motor Demonstrator encased in PVA, and the PLA / PVA Spring Motor Demonstrator after it's water bath.

The following video shows the PLA / PVA Spring Motor Demonstrator in action:

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The following video shows the PLA / PVA Spring Motor Demonstrator in a PCB etchant tank with bubbler, heater and water, which I found greatly assists in dissolving the PVA from tight spaces:

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Materials and methods

Printed in PLA and PVA on an Ultimaker 3 Extended at .1mm vertical resolution, 100% infill.

After printing, place the assembly in a water bath. After a few hours (depending on the water temperature, agitation, etc.), remove the assembly and carefully attempt to rotate the gears. If they do not rotate, return the assembly to the water bath for another few hours then try again. If they do rotate, rotate the gears enough to expose the PVA trapped between the gears, the return to the water bath. Repeat until all PVA is removed. Also, changing the water frequently will assist in expediting the PVA dissolve process.

Finally, I posted a video showing the water bath I used; a printed circuit board etching tank with an air agitator and heater. The agitator generates bubbles that better penetrate the tight areas between the gears, supports, etc., that assist in dissolving the PVA. I run the tank heater at 28 degrees celsius (approximately 82.4 degrees centigrade) which also assists in dissolving the PVA.

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Comments

26ff6ad166d63bc62785b13c68e27cac?default=blank&size=40TomN printed this ago
Carousel thumb img 2672
Printed on:
Ultimaker 3
Result:
Perfect
F511f9acc61ef49005dcf4e96661be4e?default=blank&size=40Frank Spina added this to the To Make collection ago
Mini mtb3d cirkelMTB3D added this to the Printed parts collection ago
Mini dsc05460 3Паша added this to the Пружинные моторы collection ago
C56bb8a7a01df4e38fc1e58135de6d23?default=blank&size=40JustKrys added this to the Things to Print collection ago
Mini title slideErin commented ago

I'm printing this right now...

Mini title slideErin added this to the Things to Print with PVA collection ago
Da8b4190c59bc16e472aeecb49550745?default=blank&size=40Jamie Moseley (james the philosopher) added this to the Things to print collection ago
Mini img 0338Sepio added this to the Things to make collection ago
Mini lora and iGreg Zumwalt published this design ago