Ball Plunger Spring I found that thing few years ago, I will try to replace the locking screws with it, that would make the folding/unfolding much quicker and easier :D [www.qwant.com] Found some suppliers in France too, by searching for "Poussoirs à ressort à bille" :) K0334.210 The M12 size should be good, with a ball of 8mm in the frame profile slot of 6mm. https://reprap.org/forum/read.php?283,785011,785011#msg-785011 Wed, 07 Oct 2026 14:15:49 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?283,785011,797838#msg-797838 Re: Ball Plunger Spring https://reprap.org/forum/read.php?283,785011,797838#msg-797838
And I think I see what you mean about the triangulation, as I'm considering to rebuild the Mendel sized FoldaRap, that also came in mind to add a bar.
But for the original size, the spacing between the balls and the spring force, etc. are just right :)]]> Emmanuel FoldaRap Fri, 24 Nov 2017 16:19:41 -0500 https://reprap.org/forum/read.php?283,785011,796686#msg-796686 Re: Ball Plunger Spring https://reprap.org/forum/read.php?283,785011,796686#msg-796686 I was working on a foldable printer design a few years back but stopped however I have revamped the idea and been inspired by your wonderful work. However I’m making it at a larger scale and was hoping to use a direct Extruder, which is throwing up an issue or two that I think would be best fixed by offsetting the hinge.
Also, how stable is this setup? Have you ever considered using more Vslot pivoted from the top of Z that can latch on to the Y to create a triangle and add stabilisation? It can then be unlatched to fold up and remain compact.]]> SJMaybury FoldaRap Thu, 16 Nov 2017 13:41:37 -0500 https://reprap.org/forum/read.php?283,785011,795444#msg-795444 Re: Ball Plunger Spring https://reprap.org/forum/read.php?283,785011,795444#msg-795444 benbois FoldaRap Tue, 07 Nov 2017 16:43:18 -0500 https://reprap.org/forum/read.php?283,785011,786966#msg-786966 Re: Ball Plunger Spring https://reprap.org/forum/read.php?283,785011,786966#msg-786966
The "ball plunger spring" consist of a cylinder in which a sphere is pushed outside by a spring.



It is used in mechanisms like the folding handle of a luggage (the locking position when it is extended).
]]> Emmanuel FoldaRap Thu, 07 Sep 2017 04:49:28 -0400 https://reprap.org/forum/read.php?283,785011,786908#msg-786908 Re: Ball Plunger Spring https://reprap.org/forum/read.php?283,785011,786908#msg-786908 How It works that "ball plunger spring"?]]> etilico120 FoldaRap Wed, 06 Sep 2017 19:37:46 -0400 https://reprap.org/forum/read.php?283,785011,786882#msg-786882 Re: Ball Plunger Spring https://reprap.org/forum/read.php?283,785011,786882#msg-786882
Yaaaaaaaaaaaaaay !
It works !!!




(Thanks David for the two M4 nylstop that I didn't had to complete this !)

And some videos to show how easy it became.
From 5min to 5sec !

[youtu.be] 1/4
[youtu.be] 2/4
[youtu.be] 3/4
[youtu.be] 4/4

That's so cool :D
]]> Emmanuel FoldaRap Wed, 06 Sep 2017 17:12:35 -0400 https://reprap.org/forum/read.php?283,785011,785011#msg-785011 Ball Plunger Spring https://reprap.org/forum/read.php?283,785011,785011#msg-785011 [www.qwant.com]

Found some suppliers in France too, by searching for "Poussoirs à ressort à bille" :)
K0334.210

The M12 size should be good, with a ball of 8mm in the frame profile slot of 6mm.]]> Emmanuel FoldaRap Fri, 25 Aug 2017 12:27:17 -0400