I wanted a nice way to use old, empty filament spools, so I decided to make a clock design based on them. All printed parts combined only use up about 80 grams of filament.
Update: Added a openscad file for customizing all parts to fit most types of spools. The file doesn't seem to load properly in customizer yet, so if you know openscad and can tell me why this is the case, feel free to tell me. Until i get it to work you can simply download the openscad file and customize it in the software.
All parts are designed to be printed without the use of supports. The diffusor panel on the outside of the clock is a thin sheet of white filament with a thickness of one layer, so to get a nice and even sheet your printer needs to be capable of producing nice first layers.
For mounting the diffusor to the spool I designed brackets with spacers which make sure that the distance between the spool core and the diffusor stays the same all the way around. I attached an image to show how to assemble the diffusion panel. The diffusor might look and feel a bit fragile when you first glue it in place. To fix that there's little brackets which are glued in place to cover the seams and to stabilize the thin panels.
To light up the diffusor you will need an led strip of some sort. I would recommend using a battery powered strip to get rid of the cable hanging down from the clock. There should be more than enough space to hide a battery compartment in the middle portion of a filament spool.
You will also need a clockwork. The holding bracket is designed to fit clockworks with a maximum size of 58x58mm, which should be able to house most standard clockworks. I recommend to glue it down into the bracket using a few drops of hot glue.
The bracket holding the clockwork in place should be a tight fit to your spool, since it is held in place only by friction. It cannot be glued in place, because you need to take it out to change the battery on the clockwork. You might need to break away a bit of the plastic of the spool in order to get the bracket in.
Note: This paragraph only applies to the predesigned model, you can customize the model to any spool size you like using the openscad file attached.
The Clock is designed for spools made by german manufacturer Janbex and i don't really know if they use some sort of standard size. The following two images are showing the measurements of the spool used. If your spools have different measurements, it should be pretty easy to get the parts to match your spool perfectly since they are all really simple.
Note: If you use a battery powered LED strip, you can replace the Diffusor_Seam_With_Cable_Hole with a standard Diffusor_Seam.
Non Printed Parts
1x Clock work (Standard Size, up to 58x58mm)
1x LED Strip
There are two things I would have done differently now that I finished my clock. The first one would be to install a battery powered led strip to get rid of the ugly cable hanging down.
The second thing is to put the holes which were meant to hold the filament while the spool was not in use to the bottom or to close them down with a piece of filament and glue to prevent light leaking, which destroys the pure black and white look of the clock face a bit.
Other than that I am really pleased with how the design came out and I hope a few people will like it. If you print one of those clocks, feel free to post an image of it. I love seeing what other people do with my models.
Redesigned the whole thing in openscad for customizing it for different spool sizes.
I designed an optional stand to use the clock standing on a desk or shelf. The stand itself can be printed without support, the file Clock_Stand_02 needs to be printed with support.