I don’t really have a printer, so this might not be accurate or even slightly correct. Bur, as far as I know, you have to 8install the hplip driver from the extra repositories:
$ pamac search hplip
hplip-raw-ledm 3.18.4-1 AUR
HPLIP with patch for uncompressed scanning on LEDM-based peripherals
hplip-plugin 3.22.4-1 AUR
Binary plugin for HPs hplip printer driver library
hplip-minimal 3.20.6-1 AUR
HPLIP lite build (print and scan drivers only)
hplip-lite 3.22.4-0 AUR
Only Print drivers for HP DeskJet, OfficeJet, Photosmart, Business Inkjet and some LaserJet
hplip-3.18 3.18.12-2 AUR
HPLIP, fixed version 3.18.x (with supports for some printers which were removed in 3.19), and with patch for uncompressed scanning on LEDM-based peripherals.
hplip [Installed] 1:3.22.2-2 extra
Drivers for HP DeskJet, OfficeJet, Photosmart, Business Inkjet and some LaserJet
No, I don’t know why I have it installed. Perhaps it is installed with installation.
So you can install it with:
pamac install hpliip
Hope it helps!
Edit:
Also, try running the following, in a terminal, once hplip is installed:
hp-setup