[AhtiK]

I did like the Pentel Energel 0.7mm a lot, until tried to cut waste and use the refills. Turns out the rubber and plastic becomes loose over time, for about the time you want to use the 3rd refill.

So I dropped the idea, bought 2 Lamy Safari fountain pens to rotate when one goes empty, 1 pot of Diamine ink, 1 blunt-tipped syringe to refill and never had to think about this topic again :)

[alexanderchr]

I had this problem too but Pentel recently (or at least I didn’t see until recently) released an alloy version using the same refills that should last for a long time. It’s a bit expensive for a pen but can really recommend if you liked the plastic version.