Sometimes I use the remaining silk thread manually and the silk thread placed in the rice bucket This A1 splitter is particularly suitable and has replaced my Y splitter. Therefore, I designed this fixed base. If you need to install an A1 splitter, you can try this model. stable.. This A1 splitter is particularly suitable and has replaced my Y-type splitter. Therefore, I designed this fixed base. If you need to install an A1 splitter, you can try this model. fixed.

Need to buy screws because the original ones are not long enough

Screw specification: M3*5L

Another different model is linked below，It's the same way

https://makerworld.com/zh/models/73720#profileId-78177

Below I will share how I modified it. The tail of the 4-in-1-out HUB must be pulled out, and use coarse sandpaper #120 to reduce the size of the tail to below 4.3, not less than 4.0, in order to effectively insert the HUB. Note that the original taper is between 4.35-4.6, so there will be a taper when grinding.
After sanding is complete, finally install the retainer

A1 HUB Purchase link

https://store.bambulab.com/collections/accessories-for-a1-mini/products/ams-lite-filament-hub

If you plug directly into the connector without rough grinding, you may get cuts on the PAL wire (because of the teeth inside). It is not recommended to insert directly without sanding, this is a mistake. The above are all personal opinions. for reference only