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The novo nordisk pen is the best. But you need to modify it to fit generic cartridges and it's about 10% out.
That being said why can't they sell spring loaded insulin pens? The FIASP disposable pen I have has a great spring loaded system.
The lily pen has the most mechanical advantage. Gansulin pen feels clunky but it works.


Ah shit guess I'm not up on game. All my insulin pens are manual.Most of these spring loaded pens are all made by the same manufacturers, it's just b2b so we don't really hear of it.
The birdie pen is side activated, i believe its a china clone of this
View attachment 379422GENSUPEN2 automatic injection system – BIOTON medical equipment
GENSUPEN2 - Its automatic system of insulin injection significantly improves patient comfort, minimizes pain caused by injections, enables higher metabolism control and improved treatment satisfactionbioton.com
Then you have the supposedly gansulin pen where the trigger is at the back, not sure if its a clone or whatever tho
View attachment 379423ServoPen | Reusable Pen for GLP-1, Insulin & Other Peptide Therapies - Ypsomed
ServoPen® – a high-quality fixed & variable dose or multidose reusable pen injector for GLP-1, insulin, hormones and other peptides. CE-marked, safe, sustainable, and customizable.www.ypsomed.com
almost all single use pens are spring loaded.
The fiasp pens do look kinda fat, can they be modified?

Savvio's i feel like are a love/hate item. I see a lot of people say they're their favorite but 3 out of 4 of mine would slip the first 2-12 units and I'd have to redial it while the needle was still in me. I gave all those fuckers away. The style and material is nice though.Savvios are the most consistent and easy to use. Novo pens are like holding a fine chef knife or a fine tool, but the adapters are usually printed cheaply. My favorite one is Lilly’s Luxura but they have been discontinued for years and you can only find blemished ones but it it’s an actual fine crafted piece of art. I have a Gansulin but I haven’t used it yet. I ordered 29g 12.7mm tips for it to do a trial run on my test prop.
Sounds like you weren’t priming it before each use as the instructions say.Savvio's i feel like are a love/hate item. I see a lot of people say they're their favorite but 3 out of 4 of mine would slip the first 2-12 units and I'd have to redial it while the needle was still in me. I gave all those fuckers away. The style and material is nice though.
Please describe this priming technique.Sounds like you weren’t priming it before each use as the instructions say.
Source?I would never pay that price for a single pen. I get the ConviPen directly from Bangladesh for a fraction of that cost after tariffs.
You hold the pen upright with the needle on top dial your dose and gently push the button until you see a drop of liquid at the needle tip. Then reset the dose and use. This removes the air space at the top of the vial. Sometimes you only have to do it when you put a new vial in if you get all the air out the first time.Please describe this priming technique.
Interesting, I have ordered dozens of savvios for people and nobody has had to re-prime it that I’m away of anyway. Is that true for all pens because I was under the impression that the Novo slipped because of something in the mechanism or the threads or the adapter. I will have to check that out I was going to retire the Novo and I have like 10 of them so it would be a waste.You hold the pen upright with the needle on top dial your dose and gently push the button until you see a drop of liquid at the needle tip. Then reset the dose and use. This removes the air space at the top of the vial. Sometimes you only have to do it when you put a new vial in if you get all the air out the first time.
