Hand-Screw Clamp

by jakejake, published

Hand-Screw Clamp by jakejake Jun 25, 2017


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This is a proof of concept of a new thread design which can make a hand-screw type clamp, commonly used in woodworking. It won't match the strength of an actual clamp, but I tried to make a clamp that was as strong as possible, with 100% 3d printed parts. For this, careful consideration needed to be made so that each part respects the grain of the 3d print. It is, however, still a 3d printed plastic clamp, so don't get too crazy with it!

See my process for designing this here.

Print Settings:

I printed everything with standard draft settings, in PLA. Through testing, I found that the small "SlideHinge" parts are always the first things to fail. They break off at the very tip of the end that captures the rotating knob. So if you wanted it stronger with minimal changes, you could print the "SlideHinge" part solid.


This is tricky to assemble. The design intention wasn't to make a simple clamp. It is more of a demonstration of a 3d printed mechanism to make this special type of clamp.

Also, adding some sort of wax from a candle / soap / etc. will help make clamping much smoother.

Assembly video:

Watch this thing crushing stuff:


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What's the difference between Jaw1.stl and Jaw2.stl?

Making the "slide hinges" and they want to keep coming loose from the build plate. Using a Prusa MK2S, printing in PLA with the build plate at 55c. Thinking of adding a brim and wondering if anyone else has had to do so. I've got all the other parts, just need these.

Hi JakeJake,

your design is awesome thanks again. When I show my prints to my brother he asked me if I can print few for him. He is building scale models and he need such clamps. But he needs little bit longer threads. Before I do remixing I wanna kindly ask you if you can upload two or three additional Threadsx2.stl elements - say x2, x3, x4 longer? I will be very grateful.

tolerance is too tight

may want to print the nut at 101%

Love the clamp, but did you also know you can use the same parts and assemble it the other way around and use it a a spreader.

Nice! maybe there are some special grips that can be designed for that purpose

This is a very nice design! I also like your love for details and how you present your designs, especially the exploded views. Would you like share with us how you did them ;-)

Thanks! I just uploaded my design process for these on my blog:

as far as the visuals, it is a manual process that requires a few types of specific software that is not free, but maybe I will release a guide in the future anyway.

Having dabbled in woodworking these clamps could be very useful. I see these as a way to construct a unique clamp for each situation. very good design and shows instinctive talent for design. Very good

thanks for the kind words Grampa, I might release some variants in the future.

thanks for sharing

This is amazing jakejake. Thanks for sharing.

thank you!

Thanks guys, I hope it works well for you. Might release alternate "pad" designs in the future for special tasks depending on how useful it actually is.

I made a few different pads for use with this clamp. check in remix

looks good! thanks

Great designs, thanks!

Good job man I've printed several of your things now and they all work great. Keep up the great work.

Jun 26, 2017 - Modified Jun 26, 2017

quite impressive!!
what material did you use? ABS?

wouldn't the clamps become much stronger, if you'd change the orientation of the "jaw"-files?
sure, you will need supports, but the holes will withstand much greater forces!!

thank you! It is PLA

After some early prototypes, I kept them in the orientation shown, so I must admit I haven't tried the final design in that orientation. Maybe I will try that.

The shells layered in this orientation gives the side walls a structural rib function which prevents tear-out around the holes so the holes themselves don't need to be strong. If you zoom in there is actually a tiny gap in the center of the rib, doubling the shells in that area. But I'm not sure what the effect of layer gaps in a print would have on this.

Jul 23, 2017 - Modified Jul 23, 2017
bigibomb - in reply to jakejake

printing the jaws up and down would make them weaker because of the smaller layers

What filaments are you using? I really like the matte red and matte white.

I use matter hackers pro pla for just about everything. I like the colors and I never have any issues printing with it, so I use it exclusively (I have no affiliation with them).

Oh, I've heard good things about them. Thanks!

Another awesome design, thanks for sharing!