Novopen 4
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@Stevepep If you have a moment, it would be helpful to know which version you have, which batch it came from, and what led up to the break.
You're right that the walls are thin. In my experience, most breaks happen when the pen is very cold and sideways pressure is applied to the holder, such as when pulling the cap off at an angle. The connection point acts as a lever, amplifying the force and concentrating it on the connector.
The other situation I've seen is when people push too hard, either because the liquid is too viscous or because they're trying to push past the last dose. In both cases, the failure happens for the same reason: too much force being transferred to the connector. For what it's worth, I've seen the original version break in exactly the same way.
That said, I've never seen this type of break actually damage a pen. If you're unable to use yours afterward, it's likely that the broken ring is still lodged in the housing and simply needs to be removed.
I always do my best to help anyone who has an issue, but I need people to let me know when something happens. Getting these details also helps me determine whether there's a potential batch issue that needs investigating.
@mheadroom1984 I will definitely let you know. I think digging the material out is what breaks the pen. The version is that number on the cartridge I assume?
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@guymarkparker as the creator of the NP Max, I’d suggest not trying to print one. The latest version that is even printable on FDM is 129b which has issues with clutch slipping on some carts and is a pain to print correctly. The testing team had to do a ton of work to get them to print right as the tolerances are very tight, and they still didn’t work with some needles and carts.
The current version is 146 and starting around 139 there was a full redesign to address all these out of spec carts.
@guymarkparker as the creator of the NP Max, I’d suggest not trying to print one. The latest version that is even printable on FDM is 129b which has issues with clutch slipping on some carts and is a pain to print correctly. The testing team had to do a ton of work to get them to print right as the tolerances are very tight, and they still didn’t work with some needles and carts.
The current version is 146 and starting around 139 there was a full redesign to address all these out of spec carts.
I designed one from ground up, no slippage problems. The key to printing them is the material and setting you use. I print them in PETG-CF, no issues at all, I have them on all 20 on my pens and use them everyday.
The key is the setting, especially for the treads… -
Sheesh - with the hassle & amount of work required to get these things working right - they better give you a reach around after you pin too.
Too much work & mucking around for me unfortunately.
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