Peptide Critic Community

Nice! Thanks for the ideas. Looking for something more hidden, but I’ll see about these holders

@damic thank you so much. I appreciate your help.

For those using a 3 mL syringe, what size and length breather needles do you recommend? Also, what size and length reconstitution needles work best?

@mrjoshua44 I'm going to try BAC NaCl next time. Thanks for the tip.

The v2's will be restocked in a few days by our warehouse. I opted for those because they are the same ones used for....you know. The margins on these are slim (no pun intended) but i made sure we have at least 1 style.

You probably hit a blood vessel and there was slight vacuum in the vial (assuming you keep it in the fridge) so before you hit the plunger, it drew some blood into the vial. I have had this happen with syringes but not vials(yet.) Part of the reason i use short needles (4-6mm) is that with syringes or longer needles 8mm+ i hit vessels and get a lot of bruising. Still happens but much less often.

@emkay I am addicted to pens teh xulin is great

The 12mm are easy to find. I need 5 or 6mm

the barrel of the needle holds 1-2 units so you need to prime it first, before you test accuracy.

Nice setup!

@ResearchCat Thank you. I didn't think of recalibrating the loaded cartridge. That makes perfect sense.

@brandenscheidecker That's 5ml vial. It can easily take up to 7ml if one uses the empty headspace. [image: 1780282608542-pxl_20260601_023913559-2.jpg]

Randy, I have a bunch of pens from Peptide Critic. I like the v 3.5, can you get it in a few more colors? Thanks.

No problem!

I've use 4 and 8 mm needles. Left them in for well over 10 seconds. I still get the little drips. I guess its just the price to pay for the convenience of the pen.

@SR04 said in 3ML glass cartridge fill stand (3d printer): @Commander thanks, will look into it on Etsy/Ebay. Here is a link to one of his other products. Just go on there and send him a message. Send him this picture of mine he made for me… https://ebay.us/m/rBAL9M [image: 1778928147273-img_2011-resized.jpeg]

@MyB That's the thing with using pressure canners though, the drying process. Even letting all the steam and pressure out of the vessel there is still moisture. Any little bit of water or moisture that gets left behind on the pouch can make the entire thing non-sterile. But using an autoclave with a dryer function solves that problem.

Nice enjoy! I have a V2, V3.5, V4, and a Xulin 3 from the site and every one of them is dead on accurate. I check for accuracy every time I replace a cartridge.

@phiberopttic I think it was Jeff that mentioned that Xulin only make Blue pens normally, but do a run of Red for a limited time when launching a new product. I also bought both colours of it straight away, cos he said they were Randy's favourite. Red one is out for delivery today. I wonder if we can 3d print pen bodies.

I remember going through that line and getting all those shots on Paris Island, ouch!!