As an artifactor you can wield more magical items, properly identify them on sight, swap them more regularly and apply proper maintenance to them to keep them working.

Anyone can pick up and wield a magic item and start blasting, you however can blast harder. You like to go with the flow, build yourself into either a versatile arsenal of weapons and ticks, or make sure you're the absolute best at your niche. That or just take what you can find and do what you can to make it work. 

My eye spies

At 3rd level, you have a keen eye for potentially cool new stuff, you've learned how to properly check for particular properties.

You can cast the spell "Identify" up to your proficiency per day, you regain all uses from a long rest.

Maintenance mode

At 3rd level, you like to keep your precious treasures in tip top shape, this doesn't always go according to plan, in a case where something horrible has happened to one of your babies, you may repair them to get them back in working order.

After using the last charge of a spell on any attuned magic item, if it triggers a roll to see if the item is destroyed or depleted, you may re-roll the result you must then take this new result, this can only be done once a day. As a ritual, once a day you can run maintenance on an item that has lost all of its charges to set it back to one, it may then regain them normally. You need to spend 2 hours doing this.
Each of these can only be done once a day and uses reset after a long rest.

More, I need more!

At 7th level, three items has proven to be too limiting, you need more flexibility, luckily for you, you're so adept at picking up and using magic items that you are able to use more than average.

You may attune to an extra magic item beyond the normal cap of 3. This increases by an extra 1 at the following levels, 10, 15 and 18.

Mould breaker

At 7th level, your love and prowess with magic items makes you able to break the boundaries on certain items, you can equip and use anything you see fit.

You can attune to any magic item, despite it's prerequisites. 

Itemized expert

At 10th level, you may have been previously proficient in using the item itself, now you are proficient with its power.

When making a roll with an attuned magic item that is not damage, you may grant yourself advantage for that roll, this can be done up to a number of times a day equal to your proficiency bonus.
All uses reset after a long rest. This feature cannot be used in tandem with your other class features, such as the re-rolls for "Maintenance Mode".

Exchange of power

At 15th level, your arsenal of magic items and powers is by your design, you're now able to freely move your powers to more suitable items. You can only wear so many gloves and capes after all!

As a ritual, you may strip a non legendary magic item you are attuned to of its powers, making it non-magical, then move them to another non-magical item. This will take you an hour to accomplish once a day. Powers taken from a weapon may only be applied to another weapon, powers taken from armour may only be applied to different armour and a wondrous item may only be applied to another wondrous item.
You can move these powers to scrolls to save them and move them to a more appropriate item later. These scrolls can be applied instantly to a non-magical item by anyone.

Armed to the teeth

At 18th level, you're now so proficient with your magical items that you can start using them as extensions of yourself, with a remarkable swiftness.

While you are equipped with 6 attuned magic items, you can start using any of their powers that cost an action, as a bonus action.