This barbell holder screws into the wall with 4 #8 screws, ideally with a washer 12mm or smaller in diameter. I used screws that were 2.5in long going into drywall anchors and it seems to be holding well but ideally you will be able to at least get the two middle screws into a stud because two bars is a lot of weight for drywall.

It is designed to fit bars up to 35mm wide with a collar up to 80mm.

The drywall anchors I used: https://www.homedepot.com/p/E-Z-Ancor-100-lbs-Philips-Pan-Head-Heavy-Duty-Toggle-LockSelf-Drilling-Drywall-Anchors-with-Screws-10-Pack-25220/100153998

Creality

Ender 5

No

30

I printed mine at 30% infill with 2.4mm wall thickness in PLA + as it is inside. Use your best judgement regarding what filament you use and how much infill and wall thickness. It is a big piece so it will use a lot of filament.

With those parameters mine took around 20hrs to print with .22mm layer height and used almost 400g of filament.

To get the part to fit on an Ender 3/5 you have to print it without skirts or brims. If you do not turn those off, Cura will leave it greyed out.