Proton - Open Source 3D Printer

by layerone, published

Proton - Open Source 3D Printer by layerone Mar 7, 2017
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Proton is one of two open source 3D printers designed by Layer One, the creator of Atom 3D Printers (Link to Neutron: http://www.thingiverse.com/thing:2149660)

While the RepRap project produced some functional printers, it was clear that nobody had intended to produce something for the desktop of the discerning designer. That’s where Layer One’s Proton and Neutron come in. If you're an open-source advocate, a tinkerer, and a designer with an eye for aesthetics, you’ll want one of these on your desk.

All the printed parts of the printer is right here. Proton was built in OnShape. Log in to remix your own version of Proton, it's free as long as you share what you have made. Visit our website for the BOM, CAD files, assembly guide and everything else.

Proton website: http://www.atom3dp.com/mini
BOM: http://www.atom3dp.com/mini/#proton

Atom Website : https://www.atom3dp.com
Fanpage : https://www.facebook.com/atom3D
Instagram : https://www.instagram.com/atom3dp
Group : https://www.facebook.com/groups/atom3dp
Video : https://www.youtube.com/watch?v=cEyhrgiaoCs

Print Settings


Atom 2.5 EX






0.2mm Layer Height


3 Loops, 15% Infill Minimum

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i dont find that bearing anywhere 12x16x20 copper sleeve

Can I change step motor?

Hello, where is the Ramps Board installed?

Hello, or do you find the ATOM 2.5 MK3 with 0.4mm Nozzle (for 2.5)? I can search on ebay or google I find nothing: /

I like this design and am thinking about building one, but I am having trouble finding the Steel Print Bed (250 x 190mm) can I use a glass print bed. And I am wondering if I can use a heated bed with it and where I might find that.

I'm wondering the same things, I can't find a 250mm by 190mm steel plate anywhere, let alone a heated bed.

This looks wonderful! Can't wait to make one myself.

Are you planning on incorporating the LCD into the design?
Also, where does the power supply sit?


Anyone want to modify the cold end to run a E3d style hotend or similar? Thinking a Deltaprintr hotend would work great.

yes! E3D compatible mount is in there, just download the whole pack :)

Apr 1, 2017 - Modified Apr 1, 2017

Interesting design. I was wondering, the Screw Shaft ϕ8, lead of the twist 12 is a correct description? I didn't find this type of lead screw. Also, the BOM didn't helped very much, apparently the provided links don't work for me (if you could update-it I would much appreciate it).

12 is a bit hard to find, but it does provide a faster movement. I guess you can substitute with other pitch and modify the firmware accordingly :-)

would you be able to give me a hint where I could find the 12 version?:) I did try for several days and then I gave up. Thank you!

4 days ago - Modified 4 days ago
toadharbor - in reply to cih79

Really creative extruder drive mechanism. I'm interested, have you noticed any benefits of this versus a bowden or carriage mounted driect drive? Thanks for sharing.

Other than it being really cool to look at? Can't think of any performance increase compared to a direct drive, but it sure was a fun experiment.

What's is the approximate cost for making the entire printer without a heated bed

We managed to source parts from China and it comes just below $200

Why did you run the extruder through a rotating linear shaft? That unbalances the weight on the gantry, adds inertia to the extruder, doesn't save any moving mass or flex wiring, and decreases the stiffness of the mechanism.

Because it's fun! If we're aiming for efficiency and accuracy we would build something that's entirely made of metal and super ridged.... Wait a minute....

Mar 15, 2017 - Modified Mar 15, 2017

Congrats on your work on this one ! Have you an idea of the plastic needed for both your printer ?

The extruder pieces would need to be abs, if your not planning on having a heated bed you could use PLA for the rest of the parts with a minimum of 30% infill i would say.

Your answer made me realize i was not very clear in my question... I was more asking for the total quantity (weight) of plastic needed...

Mar 15, 2017 - Modified Mar 15, 2017
Tomsull - in reply to Archiclem

Lol, okay, it uses 673.43grams of filament for the proton, if printed at a 0.2mm layer height with 30% infill for all the stl's

Was printrbot your inspiration?

Sure, with bit of lead screw fun!