Link: https://makerworld.com/de/models/2097878-syringe-funtional#profileId-2268441
I designed a fully functional syringe as an FDM proof of concept and wanted to share it + get ideas for improving it.
To avoid Z-seam leaks, the barrel is square, and the plunger creates the seal by slightly flexing the thin barrel walls. It actually works like a real syringe — just louder and not as smooth because of layer lines. PLA works great, and transparent PETG makes it look realistic.
Looking for feedback + ideas for V2 (better sealing concepts, geometry tweaks, anything really). It’s fragile by design, but it’s a fun experiment in tolerances and sealing.
What would you change or try next? 🚀
Can I suggest a name for this? I would like to see this known as a "Squaringe".
And all regular ones are now "oh-ringe"?
No they still come in many colors /s
Cylienge. Syringe.
You know what.....
No, they're cirynges since they're circle
Squiringe!
Its already catching on!
I'm partial to "squinge," myself.
I like this, but squinge is right there...
Why does this bother me so much? Cool print though!
I was thinking the same lol
Because the nozzle is round and doesnt match the square body
This is a fun idea! You could deliver actual CCs (cubic centimeters)
FYI one reason regular syringes are round (or at least a tangential benefit ha) is that round is good for containing pressure, so you can make the walls thin or exert 'high' pressures and not worry that they will bow out.
With this design at high preasures, you could get bowing on the flats and leaking there, between the plunger and the walls. As the walls bow out, they would pull the corners in, causing the plunger to bind.
I recalled from my days in engineering school that a round container was better, but I could not remembet why. Thanks for memory jog, because my next stop was going to be ChatGPT.
Ya, they described it actually working on that premise too, as they're getting the seal because the walls flex.
Designed correctly, this could be a feature?
Maybe a feature in something that is not a syringe
Say psych rn
Tpu ring with inset to seal better?
Yeah, I thought about that but decided against ist. In v1 i wanted to constrain myself to pla, petg etc. stuff everybody has and try to get the maximum out of it. But i will do a version with a tpu seal, to see how much it improves the syringe
Rubber bands and washers?
How’d you get the case so clear?
Probably just thin walls.
Now make a helical one!
But why? From a physics standpoint, there are many drawbacks of not being circular. Uneven pressure at the tip, higher forces in the corners, less wieldy in the hand, more difficult to create a proper seal around the plunger.
Minecraft syringe
Low poly syringe.
I cc what you did there!
Now get a square needle!
Vase mode?
Y has noone mentioned the wasted space when the plunger hits bottom. I believe i see a V at the bottom of the tube. So v2 could match them so there is very little wasted space
I’d suggest to print at a 45 degree angle for a bit more strength and less noticeable layer line noise. Use a designed support fin for print stability.
Weird coincidence. I was just planning a project that has essentially a square syringe component. Nice!
Ich finde es originell
Are z-seam leaks an issue with a scarf?
Scarf seams and make it round?
I can’t see how this is better than a standard syringe and you probably saved like $10. Any reason for this?
8 bit medical device
Squinge
Oh good, now I can boof my microplastics too! /s
How well does it work?
What’s wrong with triangular syringes? 🤔
why?
Since it’s square already, what about printing it on its side to make it quiet and stronger?
You could print the plunger on the side, but it flares out at the button, to stretch the case and make a seal. Also you would not be able to get a seal, because of how the layers of the two parts touch. There would be a lot of tiny holes
That’s a good point on the seal. It’s a cool project and I don’t think the noise is something I’d be concerned about, just a side effect of the manufacturing
That'd be a support nightmare.
I know if wouldn't be ideal, but if you could print it on its side that might help a lot with the smoothness of the action. If you can get it so the layer lines go the full length of the syringe (i.e., parallel to its length) instead of perpendicular to its length, the layer lines shouldn't interfere with the action, although you might get some seepage. It would be tricky, but you can do this without supports. If you set your bridge flow to something like 1.5 and your bridge speed all the way down around 10mm/s, you might be surprised at the results. There are some really cool videos of people bridging wide, flat spans without any support with respectable finishes. You might need to add a cap to the end where the plunger goes into that you cut off after so the bridge has somewhere to rest when it gets to the far end. You would also want to support under the tip (or just move it to the bottom, there's no real reason it has to be in the middle). Just food for thought!
PETG Ok
For what exactly? This would never actually be used
For transferring liquids.