The Siphon II pen by Microtech to give you the utmost strength in the design. It is classy, easy to carry. The retractable tip is activated by the lever. I reproduced this classic design and enlarged the volume appropriately to make it easier to 3D print with a better structure. Please use a lower speed and layer height to ensure the overall structural strength and thread precision.This is a fun thing, I hope you like it.

This pen uses a Fisher Space Pen SPR pressurised refill.You need a 3X12mm pin and a 0.6X10X50mm spring（The pin can also be replaced with a printed part, and the spring can also be replaced with a similar specification with a diameter of 8-11.5mm and a length of 40-60mm）.

Microtech 的 Siphon II战术虹吸笔 设计结构强度好、优雅漂亮、易于携带。可伸缩笔尖由杠杆激活。我复刻了这经典设计，适当加大了体积，以便于3D打印有更好结构。请使用较低的速度和层高确保整体的结构强度和螺纹的精密。这是一个好玩有趣的东西，希望大家喜欢。

该笔使用Fisher Space Pen SPR 笔芯.需要一根3X12mm的销和一份0.6X10X50mm的弹簧(销也可以使用打印件代替，弹簧也可以用直径在8-11.5mm和长度40-60mm之间在近似规格代替).