Twsbi Eco Replacement Nib. TWSBI ECO Creme RG Fountain Pen You *can* fit a 580 nib inside the cap of a Mini, though - so I can't imagine the 7mm wingspan of the FPR nibs being a problem. The nib on Twsbi Eco and Eco-T series is friction fit so you need to pull out from the body
TWSBI ECO LILAC FOUNTAIN PEN B NIB NoticeMark from noticemark.com
Diamond Mini nib sets are for use with Twsbi Diamond Mini fountain pens Another person that may be able to help you with a TWSBI Eco nib transplant is Pablo with fpnibs in Malaga, Spain:
TWSBI ECO LILAC FOUNTAIN PEN B NIB NoticeMark
We suggest to pay attention when you assembly and disassembly this nib because the feeder is too fragile. Another person that may be able to help you with a TWSBI Eco nib transplant is Pablo with fpnibs in Malaga, Spain: The TWSBI Classic, Diamond Mini, Vac Mini & Eco can supposedly swap nibs
Shoutout to TWSBI for the amazing customer service! They sent a replacement nib no charge for. We suggest to pay attention when you assembly and disassembly this nib because the feeder is too fragile. The nib on Twsbi Eco and Eco-T series is friction fit so you need to pull out from the body
Buy TWSBI Eco Replacement Nib F LarryPOST. The 'wingspan' of the two FPR nibs was very similar (roughly 7mm), compared with 8mm for the TWSBI Diamond 580 nib; the Mini / Classic / Eco nib is closer to 6mm As far as if it's a permanent change, it's enough of a hassle changing the nib that you don't want to be doing it all the time, and it does wear out.