V2 Reusable Pen Extender/Replacement Foot

Using a V2 reusable pen device?

Frustrated that you can’t quite get the last dose out of the vial due to the pen’s mechanical limit?

I had the same issue. The V2 pen is great in terms of quality and ease of use, but this limitation was a constant annoyance.

There is an existing solution using a spacer, but I found it easy to lose—especially when swapping vials regularly (I use one pen for different solutions).

So I designed this simple replacement foot that sits directly at the end of the mechanism, removing the need for a separate spacer.

✔ Helps extract the full dose from your vial  
✔ No loose parts to lose  
✔ Simple drop-in solution  
✔ Designed for regular vial swapping  

This has made things much easier for me, so I thought I’d share it.

Hope it helps!

Printed successfully in:
- Matte PLA (tested)

Recommended settings:
- Orientation: opening facing down on the build plate
- Supports: none required
- Layer height: extra fine preset (or ~0.12–0.16mm)

Notes:
- PLA works fine in practice, but if you want extra durability or flexibility, PETG or TPU may also be suitable.