一体打印拖链

一条用于 3D 打印机或 CNC 轴的拖链（坦克链），从打印板上取下就已经连好：九个相同的橙色链节由锥形销连接，加上炭灰色的固定端支架和移动端支架，各用两颗 M3 螺丝安装。按下 Travel，移动端往返运行 150 mm，链条像在真实的轴上一样滚过 U 形弯。每个关节上的限位齿让链节只能弯到你设定的半径，而且只能朝一个方向弯，所以上段几乎保持笔直，不会下垂。校验证明静止时链节互不接触，销不会拔出，限位在两个方向都能挡住，在平缓弯曲下，无论伸直还是在 U 形弯里，线缆都能在链内自由放置，而且全部 457 个运动姿态都不干涉。

Building the model

Loading the 3D view

No adjustable sizes

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

Change it in the Studio

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: 284 × 19 × 48 mm
零件数: 11
耗材: 65 g
打印时间: 2 h 29 min
打印盘: 1
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。

Links never touch at rest0.4 mm joint gap at every pin, plate and stop face
Pins are captureda link shifted 0.92 mm sideways or 0.70 mm along the pin hits its neighbour (2.65 / 83.20 mm³): the cone pins sit in the sockets between the cheeks and cannot pull out
Bends freely to the bend angle30.2 degrees per joint gives a 50 mm bend radius at a 26.0 mm pitch (6.0 links per half turn)
Stop at the bend angle4 degrees past the bend the tooth is into its pocket wall (3.22 mm³)
Stays straight the other wayreverse bend stops within 2.25 degrees per joint (tooth on the straight stop)
Upper run is self-supportinga 100 mm stick-out puts 0.98 N on each stop tooth (0.06 MPa shear; PLA allows 5.0); stop play lets the longest upper run (6 links) sag about 4.6 mm
Pins take a hard tug30 N pull on the chain: 0.48 MPa shear in the two 6.3 mm cone pins (5.0 allowed across layers)
Cables lie free in the chainoverlap 0.00 mm³ straight and 0.00 mm³ in the U at mid travel
Cables bend gentlythe bundle bends at 52.6 mm in the U, at least 7.5 x the 5 mm lead (37.5 mm, chain-rated cable)
Cables stay inroof slot 4.25 mm vs 5 mm leads: each lead presses in past the 50-degree lips and cannot fall out
Travelmoving end runs 150 mm (of 150 wanted, 158 mm possible) with the U 119 mm tall
Every body starts on the bedprinted standing up: every link and bracket rests on its -Y edge
Bracket ears hold the chaina 30 N tug puts 7.4 N on the far M3 screws; 1.32 MPa in a 4 mm ear (16.7 allowed)
Screws seat on the earsM3 heads (5.7 mm) land flat on 4 mm ears, clear of the gussets; 3.1 mm of ear outside each hole
drag chain stays together after printingall 11 bodies are captive: none can be pulled out along any axis
drag chain is held firmlyevery captive body is held by at least 0.8 mm (two perimeters)
lead 1 (5 mm) goes in166 poses along its path clear of every part.
lead 2 (5 mm) goes in166 poses along its path clear of every part.
lead 3 (5 mm) goes in166 poses along its path clear of every part.
M3 screws: fixed bracket goes in15 poses along its path clear of every part.
M3 screws: moving bracket goes in15 poses along its path clear of every part.
driver: fixed bracket screw goes in15 poses along its path clear of every part.
driver: moving bracket screw goes in15 poses along its path clear of every part.

可调尺寸

设置	默认	范围
Cable bundle width	15 mm	10–18 mm
Cable bundle height (cable diameter)	5 mm	3.5–6.5 mm
Bend radius (pin line)	50 mm	42–60 mm
Link count	9	7–9
Joint gap	0.4 mm	0.3–0.6 mm

零件清单

零件	数量	尺寸（mm）	耗材	时间
fixed bracket	1	48 × 48 × 19	6 g	14 min
link 1	1	52 × 52 × 19	6 g	14 min
link 2	1	52 × 52 × 19	6 g	14 min
link 3	1	52 × 52 × 19	6 g	14 min
link 4	1	52 × 52 × 19	6 g	14 min
link 5	1	52 × 52 × 19	6 g	14 min
link 6	1	52 × 52 × 19	6 g	14 min
link 7	1	52 × 52 × 19	6 g	14 min
link 8	1	52 × 52 × 19	6 g	14 min
link 9	1	52 × 52 × 19	6 g	14 min
moving bracket	1	52 × 52 × 19	6 g	13 min

制作方法

按要走的线设置线束宽度和高度（高度就是线径），再设置你的轴有空间容纳的弯曲半径。
选链节数：Travel 校验会告诉你这么多链节时移动端能走多远。
整条链沿打印板对角线立着一次打印，然后把每个关节在全弯曲范围内弯几次让它活动开。
把线穿进去，用 M3 螺丝把固定端支架装到机架上、移动端支架装到滑车上，再让链条翻转成 U 形。

打印建议

用 PLA 或 PETG、3 层壁、无支撑打印；链条是侧立的，加个 brim 能让又高又窄的链节站稳。
如果第一次打印发紧，把关节间隙加大 0.05 mm；有松旷声就减小。先打一两个链节测试你的打印机。

常见问题

悬伸出去时会下垂吗？

只会一点：每个关节在限位齿挡住之前能反向弯约 2 度，所以两端固定的 150 mm 上段大约下沉 5 mm。更长的无支撑段需要加托槽。

线怎么放进去？

装插头之前从一端穿进去，或者把每根线从顶部的开口槽挤进去。开槽比线窄，放进去就不会掉出来。

弯曲半径该怎么选？

按线缆的额定弯曲半径来；拖链专用线通常要求线径的 7.5 倍或以上，低于这个值时线缆弯曲校验会提示你。

需要目录里没有的形状？用文字生成 CAD，用你自己的话描述它

I printed this Remix