球形关节 GoPro 桌面支架

一根夹在桌边、用标准三爪接口固定 GoPro 的相机支臂。弧形 C 形夹、渐细的支臂和相机头作为一块平板一起打印,两个球形关节已经在球窝里。每个球与球窝之间都有一圈均匀的小间隙,球窝唇边包过球的最宽处,所以能转能倾,却不会脱出。夹子一端的球向桌外倾出,每个关节可向任意方向倾斜约 29 度并能整圈旋转,因此支臂向外伸出约 45 度时,相机头仍能保持相机水平。每个关节用一颗 M4 螺丝夹紧开口球窝来锁定姿态。校验证明球打印出来是活动的且不会脱出,算出每个关节倾斜到颈部碰到唇边前的角度,证明夹子转角和球颈能有余量地承受载荷,螺丝提供的夹紧力约为相机所需的四倍,夹子适合 15 到 45 mm 厚的桌板。

球形关节 GoPro 桌面支架:可 3D 打印的模型,148 × 34 × 294 mm
Building the model
Loading the 3D view
No adjustable sizes

Ask for the sizes you want to tweak, e.g. “make the width adjustable”.

默认尺寸下的规格

在 Bambu Lab A1 上用 pla 实际构建测得。拖动上方滑块时,每个数字都会实时更新。

整体尺寸
148 × 34 × 294 mm
零件数
5
耗材
73 g
打印时间
2 h 3 min
打印盘
2
支撑
不需要

工程校验

校验和参数名称直接来自 CAD 引擎,以英文显示。

  • Flare runs into the head blockthe flare grows to 15.6 mm across, 1.5 mm inside the block's rounded edge, and enters the cup with 0.0 mm of straight neck showing
  • Ball captured past the equatorsocket wraps 37 deg past the equator; opening 19.6 mm vs ball 24 mm (21.6 mm across the flats, so even panned 90 deg there is 1.0 mm of lip); pulling either joint 1.15 mm out hits the lip
  • Joints print free0.35 mm surface gap all round each ball; 1.01 mm between ball and socket at the bed
  • Tilt cone at the clamp jointfree to 29 deg in all four directions (0.00/0.00/0.00/0.00 mm3); the neck meets the lip by 33/33/33/33 deg; pan unlimited
  • Tilt cone at the camera jointhead swings 29 deg each way on the arm (0.00/0.00/0.00/0.00 mm3)
  • Aiming pose cleararm leans 45 deg out over the desk (stud 25 + joint 20), camera level and facing forward; each joint at 20 of 30 deg
  • Ball neck takes a bump14.9 MPa in the 8.6 mm neck with the arm at its widest reach (55 deg from vertical), camera bumped (x2, root Kt 1.67); PLA allows 16.7 along the layers
  • Pinch screw holds the pose1.23 N m of friction from an M4 snugged to 0.4 N m vs 0.28 N m from the camera and arm at widest reach (x4.4); slit 1.2 mm closes 0.70 mm to grip
  • Clamp corners carry the bolt13.2 MPa inside the 7 mm corner bends (curved beam x1.70, measured sections 22 / 22 mm) at 313 N from a 0.5 N m knob twist; PLA allows 16.7 along the layers
  • Clamp will not rock on the desk5.3 N m of jaw grip vs 0.95 N m from the arm sticking straight out, bumped
  • Fits desks 15-45 mmM8 x 80: at 15 mm the knob sits 12 mm under the jaw, at 45 mm the pad clears the jaw by 3 mm; throat 54 mm
  • GoPro fingers fit the prongs3 prongs 3 mm thick with 3.1 mm gaps (15.2 mm stack), M5 bore, nut pocket in the outer prong
  • Thumb screw goes throughM5 thumb screw from the left into the captured nut
  • Prints in one goclamp, arm and head lie flat in a 219 mm square turned 21 deg on the 256 mm bed, 21.6 mm tall
  • Pad and knob sit on the boltpad pressed on the bolt tip against the desk underside, knob on the bolt head 22 mm under the jaw
  • camera arm stays together after printingall 3 bodies are captive: none can be pulled out along any axis
  • camera arm is held firmlyevery captive body is held by at least 0.8 mm (two perimeters)
  • GoPro goes in35 poses along its path clear of every part.
  • thumb screw goes in20 poses along its path clear of every part.
  • M8 nut goes in20 poses along its path clear of every part.
  • M4 x 16 pinch screw 1 goes in15 poses along its path clear of every part.
  • M4 x 16 pinch screw 2 goes in15 poses along its path clear of every part.

可调尺寸

设置默认范围
Arm length (ball to ball)140 mm100–150 mm
Desk thickness25 mm15–45 mm
Ball diameter24 mm20–28 mm
Joint gap (each side)0.35 mm0.3–0.45 mm

零件清单

零件数量尺寸(mm)耗材时间
clamp195 × 133 × 2234 g50 min
arm1156 × 89 × 2224 g38 min
camera head140 × 53 × 228 g17 min
clamp pad126 × 26 × 62 g7 min
clamp knob134 × 34 × 145 g12 min

制作方法

  1. 设置桌板厚度和想要的臂长,再选球径:球越大,能倾斜得稍远一些,夹得也更紧。
  2. 支臂背面朝下一次打印,无需支撑,再打印旋钮和垫片。除非测试件太紧或太松,关节间隙保持 0.35 mm。
  3. 用力拧一下让每个球松开,装上两套 M4 螺丝和螺母,把 M8 螺栓头压进旋钮,把 M8 螺母压进夹子的槽里(构建结果会给出螺栓长度,默认尺寸为 M8 x 80)。
  4. 夹到桌边,用手拧螺丝把 GoPro 的卡爪插进三爪接口,对准方向,再拧紧 M4 螺丝锁定姿态。

打印建议

  • 关闭支撑:支撑材料会打进关节间隙,把球粘死。
  • PLA 或 PETG、3 层壁效果很好;用光面 PEI 板并检查第一层,第一层压扁是球粘在球窝上最常见的原因。
  • 如果松开后关节发紧,装相机前把每个关节在全行程内来回活动几次。

常见问题

装上 GoPro 会下垂吗?

只要拧紧 M4 夹紧螺丝就不会。校验显示,支臂伸到最远时,摩擦力约为固定 GoPro 所需的四倍。螺丝松开时关节可以自由活动,就是这样来调方向的。

能用来夹手机吗?

末端是标准 GoPro 三爪接口,所以任何带 GoPro 卡爪的手机夹都能装上。本设计不包含手机夹本身。

需要哪些五金件?

夹子用一套 M8 螺栓和螺母(默认尺寸为 M8 x 80),关节用两套 M4 螺丝和螺母(默认尺寸为 M4 x 16),相机用一颗 GoPro 手拧螺丝和一个 M5 螺母。构建结果会按你的滑块给出准确长度。

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