markimus [1] filed a deletion request for flashprint [2]:

I've just attempted to install this package and I get the following
error: "Failure while downloading
http://www.ishare3d.com/3dapp/public/FlashPrint-
ii/flashprint_3.20.1_amd64.deb
    Aborting..."

[1] https://aur.archlinux.org/account/markimus/
[2] https://aur.archlinux.org/pkgbase/flashprint/