Roosted7 [1] filed a orphan request for 3dslicer [2]:

Hi,

This package has last been updated 2017-11-21 and has been flagged
out-of-date since 2018-01-02. I commented 2018-07-14, but also no
response to that :(

I've been maintaining the nightly version of this package and would
like to keep the regular version up-to-date as well.

Thanks!

[1] https://aur.archlinux.org/account/Roosted7/
[2] https://aur.archlinux.org/pkgbase/3dslicer/