Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Solo Finger Pen

by WorksBySolo, published

Solo Finger Pen by WorksBySolo Feb 20, 2017
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Solo Finger Pen by WorksBySolo is licensed under the Creative Commons - Attribution license.

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45783Views 6836Downloads Found in Engineering


UPDATE: 3-19-17
New model files have been posted. They are now sized as millimeters. The previous models were posted as inches.

This mechanical finger can be a lot of fun to play with, but can possibly serve as prosthetic for someone with missing a thumb or other fingers. Additional parts needed: a basic flexible "BIC" pen insert. Four (4) M3 x 10mm screws with washers. Other small screws may be substituted.

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Support is a must. I have positioned models at an angle that has worked well for me.

I recommend 3 shells for wall thickness.


Some clean up will be needed, depending on the type of support used.

How I Designed This

To see how I designed this go to my YouTube Channel: https://www.youtube.com/c/worksbysolo

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Hello, I am new to 3d printing and I have a few questions. Should wraps be set to Touching build plate or everywhere? Also what should the shell thickness be? Thank you for your time, I am hoping to use this because I recently broke my wrist and think it will make it easier for me to write.


I think you are referring to support as well as rafts. So, the answer is yes, full support everywhere (NOT just from build plate, or raft).

I recommend 3 shells for wall thickness, and 20-25% infill.

I hope this helps.

I meant rafts, not wraps... stupid text to speech!

Is it possible to scale just the opening for the finger? As you scale the entire thing smaller of larger, it could change the size of the opening for the pen. Are you post processing this pen?


Attached are all the pieces that you will need to customize the finger Pen. Start by using the file opening command, "New Design From File" under the little file icon in upper left of window. I'm not very good at fusion yet, so i'm not sure how to bring multiple parts into one project. I do know it's possible though.

Because of the way it imports into Fusion, you will need to re-group the surfaces into "bodies" (I don't know how to do that). Then you should be able to subtract a smaller or larger finger cavity. There is also a properly sized BIC pen tip that can be subtracted, once the re-sizing is done.

You will need to get assistance from Fusion support if you have questions.

Hopefully will work for you. Please let me know how it goes. I'm looking forward to seeing your results!

Have fun!

Thanks! Ihope I can make this work and possibly post a few remixes.


Sorry to say that it is not set up to be parametrically scalable at this time. I've attempted to post the editable source CAD files here, but for some reason unknown to me, Thingiverse no longer allows these file formats posted to the main pages.

Do you have a CAD application where you can import STEP format files? I may be able to send it to you directly.


Nice design, it might also be a good basis for an enclosed exoskeleton for your hand.

Can I see the dimensions for the design please? At least the hole size for the finger and the thickness screws.

So brilliant! Great job with this design. I've had this on my list of things to design for too long. And you DID IT! Really nicely done. Can't wait to print one and try it...

Cool! Have fun!

Looks nice yes, but you never wrote this with that "thing". It is not possible to write with kind of that nice looking.

Super cool but there is not cap

It's the Gom Jabbar in Dune story !!! ;o)

Now I can lift my middle finger without a trouble...

oh,i had made one,but snap joint can not complete occlusion,some material have to cut of, can you help me?

Good and beautiful design. Have not printed yet.
Maybe nice for my father. His right hand is bad now.
Screw-less design is better.
Thank You for sharing.

Thanks for the suggestion.

To all,

I have re-posted the model. It is now sized in millimeters.

It is the same model. The original was in inches.

Thank you for the comments.

Comments deleted.

All in all a good idea.
I did print it to fit my finger, but - i'm sorry to say - it is not easy to print and comes out much too clumsy and heavy.
A stiff single fingerpiece, printed without joints in a 'Voronoi'-style would be much better - print it standing up from the platform on a small raft and do not make it more than 4 or 5 layers in thickness with no infill - no need for supports - apart from the bottom up (you could design a break away part with one or two layers there). Less material, less printing time, less finishing, no screws and better wearable - no sweating in warm climate.

Hello petercb,

Thank you for sharing your thoughts. I do consider this to be a work-in-progress. With help from other designers like yourself, it can be refined to be easier to print and more efficient with materials.

Please do go forward with the changes that you've suggested. Be sure to post your version back here to Thingiverse for others to enjoy.

Regards, Bernie Solo

how long should this take to print

can u plz make 1 Solo Finger Pen that fit u so i can copy it plz )=

The author answered me and he told: "This model is created with "inch" units. Multiply by 25.4 to convert to millimeters. Let me know if this helps." So, in Cura scale to 25,4 .

Great design! thanks!!

Ok, thanks for the info!

Comments deleted.

What scale and unit of measurement are these supposed to be printed in?

what is the scale that i should use???? I have like a medium sized finger- because im 10

Same. When I put it into a slicer it is really small.

Comments deleted.