Clock model for education

For education there are clock models available for kids to learn digital versus analog time. These model clocks are rather small, flimsy and expensive. My wife needs one. She borrowed an original clock model from a collegue and asked me if I could create one. Well, yes I can but differently.

The original thing has a few 'flaws':

1. It is rather small (about 10 x 12 cm).

2. It has a rivit in the middle for the hands to be connected. In a bag/purse the rivit can damage other items in the bag

3. The hands move over the numbers on the dial (which bothers my wife), also the difference between the large and small hand is not very obvious

4. The model has an area on which digital time can be written and erased with whiteboard marker. But whiteboards tend to get smudged (even after cleaning)

So I made my model with some improvements:

1. My model is rather bigger but still fits in between books

2. The rivit is gone. I printed magnets inside the hands and the clock face. On top of the clock model I created 2 small pouches in which the hands can be stored. Also the hands have a small dent and a small bump where the magnets are so the hands will stay neatly on top of each other

3. The hands are created so the numbers 1-12 don't get covered by the big hand. The hands have an arrow shape which are visibly different.

4. The part where time can be written, I made a drawer in which you can place paper sheets or whiteboard stickers (cut to size, laser template added). For the whiteboard stickers I added 2 plain 0.6mm rectangular parts on which the stickers can be placed.

Printed on my Prusa XL with 5 toolheads and 0.6mm nozzles. I used TPU for the clock, PLA for support parts which have to be removed after printing.

The 3MF file has all supports on tool 5.

I used rather small layer height (0.10, 0.15 and 0.20mm) because I wanted the clock to be not to be too thick. The end result is 5mm thick. But that comes at a cost.The magnets have just 0.5mm TPU above and below and where the dents are, the thickness is even just 0.25mm. So preferably at these places print at small layer height so at least 2 layers will be made at the 0.25mm thick parts.

The support parts from the main body are NOT merged with the main body. I did this because when I did merge all parts, the horizontal separation line between TPU and PLA were not seen as different parts so no top or bottom layers were created between the 2 materials. (I made 0mm distance for extremely smooth surfaces inside the drawer and pouches). When the parts are not merged, the supports have nice top and bottom layers where PLA and TPU touch.

Extra needed:

3 disc magnets 12mm diameter, 1.5mm thick.

When inserting while printing put all magnets with the same pole in the same direction (for instance all magenets having North facing up)