How many magic items can you attune to at once?

three Magic Items
An item can be attuned to only one creature at a time, and a creature can be attuned to no more than three Magic Items at a time. Any attempt to attune to a fourth item fails; the creature must end its attunement to an item first.

Can an Artificer make multiple magic items?

Regarding replicate magic device the artificer can learn the infusion multiple times, each time for a different magic item. Other than replicate magic item the artificer only gets 2 infusions that aren’t for armor weapons or shield, those are: boots of the winding path and homunculus Servant.

Can Artificers replicate any magic item?

You can just choose any item you want to replicate. You will however need a non-magical item to infuse the infusion into.

Can you combine effects of multiple magic items?

Magic Item Compendium has rules for combining effects of multiple magic items, with the only caveats being cost (+50% cost of the more expensive item/effect, unless it has a price listed under the table of common effects on p.234) and slot limitations (can only combine effects of items that occupy the same body slot).

How many magic items can I wear at a time?

The more powerful items (rings and otherwise) have an “attunement” requirement (DMG, pg. 138, col. 2, para. 1) which, among other details, limits the magical benefits to 3 such items.

Is there a limit to the number of magic rings?

There are no restrictions beyond using common sense as to how many rings you can wear. This means you may wear a magical ring on each available finger, with the following restrictions, which apply to all magic items: You cannot attune to two more than one copy of an item, with the specific example given in the rules of two rings of protection.

Do you have to be attuned to all magic items?

Many magic items require attunement, which is a process that lets a specific character make use of the item’s magic abilities; non-attuned items only provide their non-magical benefits. Your character may only be attuned to three items at any given time. For details, see “Attunement” on pages 136-138 of the Dungeon Master’s Guide