A1/A1MINI Toolhead (Extruder, Hotend, Gears) Advanced Cooling Kit

An advanced version of the a1 toolhead cooling kit, which has been iterated through 76 prototypes. It includes cooling for the extruder motor, gears, and hotend. If you use this kit and still have insufficient cooling, resulting in extrusion jamming, then it's likely due to other issues. We recommend printing with PETG that can withstand temperatures of 70 degrees Celsius or higher (PETG shrinkage varies, so you need to adjust it yourself).

Above includes

A toolhead front cover compatible with 4010 fans, which has been designed for air guiding and cable routing, and you can choose between connecting to the mainboard's 5V or using external power. The front and the hotend have also been assisted with cooling.

2 4010 fan covers, one lightweight, one decorative.

A dual-fan extruder cooling bracket, which combines a 4010 with a 3010 fan. The 3010 fan has been designed to avoid the filament cutter, and it supports snapping into place.

We recommend using this type of 4010 fan, which can accommodate an M3 nut and is also inexpensive (3 yuan, 2 yuan on PDD, and you can even buy one with dual ball bearings, but the cable is short).

For fans, we recommend a 4010 with an RPM of 4500 or higher, and a 3010 with an RPM of 7000 or higher. Add an aluminum heatsink for assistance, and you can use external power or connect to the mainboard's 5V. There are tutorials on bilibili.

After an hour at a chamber temperature of 35 degrees, the cooling effect is as follows: the extruder gears are 5 to 8 degrees lower than the extruder, and the filament with a heat resistance of 60 degrees has no cooling issues at all.

Hardware (they can all be secured with clips, but screws are better):

M3x15 thin flat head screws (6mm head) many

M3x10 countersunk screws (6mm head) many

M3 thin nuts

or

Short self-tapping screws for fans, corresponding to KRM3 and M4 (if you buy 4010 fans, not given, not easy to buy)