Schlagwort: 3d printing

Nine different little low poly pumpkins ready to be printed for Halloween. Included are: Chompy, Slurpy, Crushy, Piercy, Slicey, Crunchy, Munchy, Smoochy and Squashy

They print quick without any support.

They can be stacked by snapping them together. LED lights can be put in them through the bottom.

Use single little pumpkins as decorations or stack them together then you can have them as a tower or hang them up.

Want to print them bigger and use a torch light with them? – Here is something for it: http://www.thingiverse.com/thing:1091056

On Twitter: https://twitter.com/TocoGamescom
All my Designs: http://www.thingiverse.com/Davision3d/designs/page:1 (sending a tip works now)

For my electronic projects I often need battery holders of various size and for different number of cells: single, multiple cells in parallel or in series, or serial lithium-ion type cells with connectors for balanced charging between the cells.

So the project here was to generate fully parametrized, printable battery holders for cylindrical cells of arbitrary size and number. The additional challenge for me was to have the battery sit firmly in the holder without the use of the metallic spring that is usually found at the minus pole. In this design the metallic spring is replaced by a flexible printed curled structure, which presses the contacts firmly to the battery. This plastic spring flexes about 1 – 2mm, which is just what’s needed to comfortably insert and remove the cells.

The contacts for the plus and minus pole can easily be made by a few windings of the uninsulated ends of the connecting wires. Each battery compartment contains are several holes to the outside as well ad to the neighboring compartments, through which connecting wires can be passed for easy configuring of parallel, serial or balanced-serial battery packs. Also, on the bottom of the case, there are longitudinal and traversal wire channels, which can be used for assing wires outside the case.

Given that the printed plastic spring needs to be flexible, ABS is the material of choice here. Also, I use a some „ABS slur“ (mixture of ABS and acetone) to cover and insulate the otherwise exposed outer part of the pole connectors.
In addition to the SCAD source file, I have added STL files for 1/2/3/4 cells of type AA, AAA, 18650(Li-Ion), as well as single cell versions for 18650P (protected Li-Ion), CR123A (aka 16340) and C (this one is untested yet, as I don’t have any C-cell around here).

Of course, you can also just use these battery holders without any wiring to serve as battery cases, for carrying your spare batteries around. But for this, you should also have a look at my battery caps…

Update 2014-09-17: Upon request of user wohenzhuce I have also added STL files for 26650 type LiFePo Cells. These are still untested. They were produced in OpenScad with the call:
flexbatter(n=n,l=65.7,d=26.4,hf=0.72,shd=3,eps=0.28);

Update 2015-04-10: Upon request of user h4wk3y I have now uploaded extra long versions (70mm) needed for some protected 18650 cells, these are named flexbatter18700xN.stl._

Update 2015-07-25: I just published a new version of this project which supports multi-cell compartments housing 2 or 3 cells in a row:

The episode in [ENGLISH]: http://www.mojoptix.com/?p=108
L’épisode en [FRANCAIS]: http://www.mojoptix.com/?p=75
Note: To see more inventions and contraptions (like this one ), suscribe to Mojoptix on Youtube !

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Update

For those who have trouble slicing the gnomon, I ran the files through netfabb and re-uploaded them as:
— Gnomon_Southern_NETFABBED.stl
— Gnomon_Northen_NETFABBED.stl
Let me know in the comments if they don’t still behave nicely with your slicer.

If you wish to print the gnomon in two halves :
— Gnomon_Northen_half_1_of_2.STL
— Gnomon_Northen_half_1_of_2.STL
They should fit on a 100×100 platform. (Thanks Zarlor for building these two files and fixing them ! )

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[ ENGLISH ]
Tadam !
A Sundial displaying the time inside its shadow, with actual digits ! There is a tiny bit of magic inside…

No batteries, no motor, no electronics… It’s all just a really super-fancy shadow show. The shape of the sundial has been mathematically designed to only let through the right sunrays at the right time/angle. This allows to display the actual time with sunlit digits inside the sundial’s shadow.

The sundial displays time (with actual digits !!) from 10:00 until 16:00, updating every 20 minutes.
You can precisely adjust the displayed time simply by rotating the gnomon (the magic box that displays time). So you can even adjust for Daylight Saving Time.

You’ll also need :
— an (empty !) jam jar
— 3x M6 screws, flat head, length = 20 mm
— 1x M6 screw, flat head, length = 50 mm
— 4x M6 nuts
— 4x M6 washer, outside diameter < 14mm

[ FRANCAIS ]
Tadam !
Un cadran solaire qui affiche l’heure dans son ombre avec des vrais chiffres ! C’est un peu magique.

Sans piles, sans moteur, sans électronique, etc… Il s’agit juste d’ombres chinoises très compliquées. La forme du cadran solaire a mathématiquement conçue pour laisser passer uniquement les bons rayons du soleil au bon moment/angle. Cela permet d’afficher l’heure en chiffres lumineux à l’intérieur de l’ombre du cadran solaire.

Le cadran solaire affiche l’heure (avec des vrais chiffres !!) de 10:00 a 16:00 toutes les 20 minutes.
On peut ajuster l’heure en tournant le gnomon (la boite magique qui affiche l’heure) sur lui même, par exemple pour passer de l’heure d’été à l’heure d’hivers.

Vous aurez aussi besoin de :
— un pot de confiture (vide !)
— 3x vis de taille M6, a tete plate, longueur = 20 mm
— 1x vis de taille M6, a tete plate, longueur = 50 mm
— 4x boulon de taille M6
— 4x rondelles de taille M6 diametre exterieur < 14mm

Timelapse: https://www.youtube.com/watch?v=EoGVb82uCnA

Model of Amazon´s Echo Dot 3
For your own developments around the Echo Dot 3 I put here a template of the Dot as Sketchup file. You´ll find the skf-File in download section „Thing-Files“

Click in here too:
DeckenHalterung
Ständer
WandHalterung

Modell von Amazon´s Echo Dot 3
Für Ihre eigenen Entwicklungen rund um den Echo Dot 3 stelle ich hier ein Modell des Dot als Sketchup-Datei zur Verfügung. Sie finden die SKF-Datei im Downloadbereich „Thing-Files“

Siehe auch:
DeckenHalterung
Ständer
WandHalterung