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3D Printed Numechron Clock

by Victorrr161, published

3D Printed Numechron Clock by Victorrr161 Jun 13, 2017
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3D printed version of the numechron digital clock. It's my first version. Not really convenient in assembly, but completely working. The instruction for assembly will be later.

Update 10-4-2017

Changed the holes for the gearmotor. Now its mounting has become more universal. The font of digits is changed to more bold. This made it possible to make them from plastic of contrasting color. The base part now consists of two parts. This allowed to simplify the assembly. Also added holes for the PCB.

Print Settings


Anet A8








20 %


Non-pintable Parts

Screw & Nuts


28BYJ-48 with 4 mount hole




The circuit is built on PIC16F628A and ULN2003A.
KiCad EDA was used for the development.
download schematics


MPLAB X IDE was used for the create program.
download firmware
I'm sorry that there are no comments in the program. I hope that it will be clear.
It's very very simple :)

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I used a motor with 4 mounting holes.But I do not see any obstacles to using other motor variants. Example with a motor with two holes:https://www.thingiverse.com/make:430768

3D Printed Numechron Clock
by 3DMB

Does this need a four mounting hole motor or will the widely available two hole one work?

hi, i'm trying to print this project but i didn't understand where every single screw goes... can you tell me where i should put them? Thanks

great job ! i will print it soon and then improve it .

Hi All,

I have printed all the parts for the Numechron project and am in the process of assembly. I am moderately experienced in this kind of space, do some design myself, love a puzzle, and was expecting it to go together pretty straightforwardly. However I have a problem at each end of the assembly I was not expecting.

I am using the v0038 series.

The Tens of Minutes wheel assembly (parts 001, 003 & 002) fits perfectly in the space allocated for it in part 009 at ~36 mm in width. Which leads me to believe that the scaling is correct. Also the the entire part 009 is 130mm long which is consistent when I look at the STL file.

However at the seconds end the combined width of the seconds wheel and the units of minutes wheel assembly (parts 005, 006 & 004) are a total width of 45mm, but the space available adjacent to the drive motor is only ~38mm. I cannot make it fit.

At the hours end the hours wheel assembly (parts 007 & 008) is measured at 43mm wide by caliper and is consistent with the STL file when viewed on the screen. Seems my print is OK. However at the hours end of part 009 the available space is only ~35mm. Again my wheel won't fit into the space in part 009.

I have had a really good look at this before writing this. All my wheels and their assemblies fit very nicely together and measure very closely to the design sizes. Part 009 seems also to be correct as per the design file but if there is a trick to assembly I am missing it.

Any useful suggestions would be most appreciated.

Regards, Fred.


I added another image with dimensions in the description. I hope it helps. The assembly does require some sleight of hand :). (I think to make a new version of the base, consisting of two parts. It can simplify the assembly.)

Hi. Thanks for that. It is helpful. I will polish my magician skills and see what happens. Regards.

I have the hours wheel in place and have posted some pictures (pretty low resolution - sorry - but the aim is to show only how it could be done) to describe how to do it under "I made one". Some may not need it but others may find it useful. I have a pdf file file with some more details but can't seem to be able to post it.

Victor if you find this useful please use it. If you want the original word or pdf file/photos just ask.

Regards, Fred.

Sorry, it seems I'm a little dumb :). Can you point me to the assembly guide?

Done, sorry!

I finished the control board. Shematics and firmware are available in the Electronics section.

Victorr161, Great, thanks off to hardware store for tube :)

Hi, everybody.
I added partlist and instructions.

Thanks! I started to print the parts and they are just very well designed!

I am going to try to 3d print the "aluminum rod." I don't know if the motor drivers have enough granularity to get the speed right but I will try them out. Worse case I can use an Arduino or a Teensy to drive the motor.

Print finished, and found that MR84ZZ bearing fitted the parts great with 4mm steel rod. assembly looks good so far, but got to wait for delivery of the moter and driver though.

All the peices fitted into each other with great tollerances, the minute tens wheel rubbed a little on the frame, so I sanded the ends a little.

The bearing fitted the frame and wheels great, i guess for the minute right wheel it is only held at the one end.

Printed the first 8 parts last night, and they all look great, the tollerances for the inserts are perfect (printed on Prusa I3). will print out the last 7 parts tonight.

I presume you need some smooth rod for the dials to turn on.

I printed part 9 which is the main frame and it was quite easy to print. The holes for mounting the motor are about 1mm off, too far back perhaps this might be specific to my printer. I might print on another printer, melt a hole using a soldering iron, or use hot glue.

I've ordered a stepper motor and remote controller, will give me time to print it :)

Great Project! What motor are you using?

Stepper gear motor 28BYJ-48 with 4 mount holes.

Thanks I have a few in stock. What kind of stepper motor driver are you using and what software if any? Could you post an ebay link to the parts you used? I would like to make one of your clocks. Wow! Great Project.

I may try not using Ardrino because you can get stepper controllers that control the speed with remotes or push buttons.

Also at first glance part 6 looks a bit small.. Is this a pin?

At the moment, clock are connected to a board from one of my old designs. This completely homemade board based on PIC16F628A and ULN2003. A new driver for these clock is being designed. I think it will be ARDIUINO PRO MINI and ULN2003 module.

I have a bunch of spare motors, easy drivers, teensy's and ardiuino's lying around. I think I might try to print the parts and fit a spare motor I have. Then I might use


as to not need to use too something that needs programming and I can easily tweak the speed. I may start printing parts over the next few days.