Twist-out Core Ballpoint Pen

This is the second ballpoint pen I developed. The previous one was a click-type, this time it's a twist-to-retract. Here is the link to the side-click ballpoint pen

Suitable for refills 110MM long with a 20MM spring clip at the front. Springs can be selected from 0.5*20*5 or 0.5*25*5

There are 5 parts in total

Step one. Combine 1 and 2. In this step, pay attention that both are parallel when inserting 2 into 1

Step two. Insert 3 from side 1 and twist it inward. Note that the cross axle faces inward

Step three. Twist on 4, insert the refill, twist on 5, and it can be used normally

Special attention, do not use PLA material, PLA's toughness is insufficient, and the buckle will break during the first step

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These are the pen holders and desktop cleaning carts I made, welcome to click the pictures to see