Short Ergonomic Clickable Pen - 0.4mm variation

Ergonomic Pen

This is an extremely comfortable pen with a reliable clicking mechanism. 

It is just a variation of the INCREDIBLE original work here.

Instructions

A full pen is built with:

• Pen Case
  • 1️⃣ tip end where the writing tip comes out
  • 2️⃣ clicker end where the pen clicker lives
• 3️⃣ Internal Clicker Mechanism
  • this part looks a bit like a lightsaber I suppose
  • This goes at the non-writing end of your pen ink cartridge 
  • This part interacts with the internal geometry at the top of the clicker-end casing to create the clickable pen extension/retraction behavior
• 4️⃣ Pen Clicker Cap
  • this part looks like a cup with serated edges
  • this part goes on top of the clicker mechanism at the tip of the ink refill before you screw the pen together.
  • This is the part you actually push with your thumb to activate the pen 

You then need a pen ink refill and a pen spring.

Changes from the original:

I had two problems with the original

1. The original is explicitly designed for printing with a 0.2mm nozzle, but I'd like to be able to print with 0.4mm by default and only make it higher detail for special prints.
2. The original did not work with the ink I like - the ink refills I prefer are the Pentel Energel. These are about 5% larger in diameter than the Uniball refills the original was built for.

To address these issues, I did the following:

• Expanded the tip casing hole to make it easier for a wider variety of pen ink refills to work smoothly in the pen
• labeled the components in english for my own understanding
• scaled the entire model enough to let the pen refills I like work
  • 👍 thankfully, it seems that the previous uniball refills still work fine in my variation too! 
  • All together, I've tried g2 inserts, uniball one and one p refills, zebra gel pen refills, and of course the Pentel Energel refills. No issues so far with any
• Provided small, medium, and large internal click mechanisms
  • The original internal mechanism was pretty fragile for me, but luckily it seems just the upscaling + 100% infill has made them very reliable
  • I also added a modifier to get the cap to bridge more reliably by filling the cylinder cutout in the center, adding a ton of walls, and printing the walls from the outside in
  • this also let me remove the supports for the internal component, making it much easier to print many of them at once and use them without manual finishing
• A note on the length of the internal click mechanism
  • I found that I had a weirdly strong preference for a pen that stuck the ink refill tip further out than the original
  • different refills, different people all will have a different preference
  • The taller you make the mechanism, the less the pen tip will extend!
    • this was counterintuitive to me, but it makes sense if you think of the length of the mechanism as providing more room to store extra pen refill length in. Or, I mean that's how I think of it.
  • The casings are marked so I can keep track of them in my supplies, but its not important to the design if you want to remove those
    • Small = shorter = LONGER PEN TIP = - (minus sign) label
    • Medium = the size I preferred = typical pen tip extension = ~ (tilde sign) label
    • Large = taller = SHORTER PEN TIP = + (tilde sign) label