I had created a top mount system for various do-dads and connectors, cable management etc. for the A1, which can be found here A1 Top Mount Accessories Rev 2 by Jeff Smith - MakerWorld and then I was asked to create a toolbox for the A1 Mini, which can be found here A1 Mini Top Mount Toolbox by Jeff Smith - MakerWorld, Subsequently a top mount accessory set for the A1 Mini A1 Mini Top Mount Accessories v3 by Jeff Smith - MakerWorld.

and lastly, I was asked if there was a top mount toolbox or could I create one for the A1, which is the one you're looking at :) All of the accessories in the links above can be used with this toolbox if desired. This toolbox for the A1 uses a riser to raise it above the travel of the print head. Note that it's up to you to make sure whatever combination of accessories and mounts you use, that there is clearance. 

That said, I was asked to create this, so did.  The only thing I am not fond of is the hex wrenches will jiggle a little, so when testing I put a piece of electrical tape on the bottom of the toolbox over those holes, so they stopped most of the jiggling.

This toolbox can be oriented two ways, parallel/in-line with the top bar of the A1, or perpendicular towards the back. See the pictures in the model for examples. My personal preference is perpendicular to the back. Less space taken up and more clearance for the print head. Once you've printed the three pieces that make up the toolbox, clamp and mount, you can decide as they just configure one way or the other.

There are also 2 clamp/receivers that the toolbox and riser attach to. 1 of them is called “tight” and the other is “standard”. In many cases, the standard should work just fine as not only does it lock with the clamp, the whole thing snaps onto the top bar. However, for the paranoid in the audience, the tight version is just that, very tight, and you'll likely have to turn the printer sideways and work at it a minute, but once it's in place, it's in place. Personally, I use the standard.

Note that it's not a part of the toolbox, but I added an accessory to the .3MF which is a remix of a Bambu Lab tool hanger. It can be added or removed using the accessory slots/holes. https://makerworld.com/en/models/91868#profileId-98268. Props to the designer.

In the pictures, the scraper I use, which will fit the hole perfectly is from Bambu Lab Bed Scraper by Johny3D - MakerWorld. Props to the designer for a great scraper.

I used M3 barrel head hex bolts, but the screw head hole is 7mm so anything that fits in there with a 3mm screw/thread should work fine.