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Troisieme Main / Third hand 3D Printer File Image 1
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Troisieme Main / Third hand

VSVlab avatarVSVlab

January 27, 2026

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Description

FR (English below)

Troisième main de type étau avec pression de serrage variable.

Matériel nécessaire :

2 Vis M4 x 30 (accepte jusqu'à M4 x 50)

2 Vis M3 x 25  (accepte jusqu'à M3 x 50) Optionnel selon le choix de fixation.

2 Écrous quarrés plats DIN 562 (7 mm de côté et 2.2 mm d'épaisseur)

2 Rondelle M4 large (13-14 mm de diamètre extérieur)

2 Tiges ou tubes de 8 mm de diamètre par 125 mm de long. De préférence tige pleine en inox, mais tube creux et alu.

2 Ressorts, diamètre intérieur entre 8.5 et 9.5 mm et diamètre extérieur intérieur ou égale à 12 mm, longueur 70 mm (sur les photos, j'ai utilisé deux 50 mm et deux bouts de 20 mm coupés sur un troisième ressort).

Coller les deux vis M4 x 30 dans "AS-BoutonM4.stl" avec une colle forte la vis doit dépasser légèrement du bouton afin que le serrage se fasse métal sur métal

Coller les 2 tubes/tiges dans AS-Base.stl

Pour la partie haute, vous pouvez soit la coller (non démontable) soit la fixer avec les vis M3 x 25.

Si vous choisissez la version démontable, ce que je vous conseille fortement, vous devrez percer les tubes/tiges. Trou diamètre  3 ou 3.2 mm avec le centre à 3.5 mm du bord de la tige/tube (voir photo). Il est inutile de serrer les vis, car elles ont le rôle de goupille, elles doivent juste ne pas dépasser. 

Pour la version démontable, assemblez les deux tiges/tubes sur "AS-BarreHaut.stl" avec les vis M3 avant de faire le collage des tiges/tubes dans la base vous assurant ainsi que les trous seront alignés.

Pour la version collée, assurez-vous bien d'avoir mis les pièces nécessaires avant de coller. Dans l'ordre, collez les tiges dans la base. Après séchage, placez la partie mobile suivi des ressorts et collez la partie haute. Les mâchoires et mors seront placés après séchage complet.

Emboitez ensuite les deux couvercles en commençant par AS-CouvercleInt.stl.

Commencez par l'anneau fermé et ensuite la partie ouverte, pareil pour AS-CouvercleExt.stl.

Placez les vis/bouton M3 avec leurs rondelles. Le côté de la rondelle qui a un morfil (le côté qui accroche si vous grattez avec l'ongle) coté base donc opposé à la vis.

En cas de question si j'ai manqué de clarté ou oublié un truc un petit message et un peu de patience.

Voilà. 

EN

Third hand clamp with variable clamping pressure.

Required materials:

2 M4 x 30 screws (accepts up to M4 x 50)

2 M3 x 25 screws (accepts up to M3 x 50) Optional depending on the choice of fastening.

2 DIN 562 flat square nuts (7 mm side length and 2.2 mm thickness)

2 large M4 washers (13-14 mm outer diameter)

2 rods or tubes 8 mm in diameter and 125 mm long. Preferably solid stainless steel rods, but hollow aluminium tubes will also work.

2 springs, inner diameter between 8.5 and 9.5 mm and outer diameter equal to or greater than 12 mm, length 70 mm (in the photos, I used two 50 mm springs and two 20 mm pieces cut from a third spring).

Glue the two M4 x 30 screws into ‘AS-BoutonM4.stl’ with strong glue. The screw should protrude slightly from the button so that the tightening is metal on metal.

Glue the 2 tubes/rods into AS-Base.stl.

For the upper part, you can either glue it (non-removable) or fix it with M3 x 25 screws.

If you choose the removable version, which I strongly recommend, you will need to drill holes in the tubes/rods. Hole diameter 3 or 3.2 mm with the centre 3.5 mm from the edge of the rod/tube (see photo). There is no need to tighten the screws, as they act as pins and should not protrude.

For the removable version, assemble the two rods/tubes on ‘AS-BarreHaut.stl’ with the M3 screws before gluing the rods/tubes to the base, thus ensuring that the holes are aligned.

For the glued version, make sure you have all the necessary parts before gluing. In order, glue the rods into the base. Once dry, place the moving part followed by the springs and glue the upper part. The jaws and clamps will be placed after complete drying.

Then fit the two covers together, starting with AS-CouvercleInt.stl.

Start with the closed ring and then the open part, and do the same for AS-CouvercleExt.stl.

Place the M3 screws/knobs with their washers. The side of the washer with a burr (the side that catches if you scratch it with your fingernail) should face the base, opposite the screw.

If you have any questions, if I have been unclear or forgotten something, please send me a message and be patient.

Voilà.

Translated with DeepL.com (free version)

License:

Creative Commons — Attribution — Noncommercial — Share Alike

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