My first iteration of the soldering machine was based on Prusa MK3 chassis. It worked well enough but the wiring was very messy and I was not happy with it. It was more of an experimental platform than something useful.
For V2 I decided to use an old MendelMax 3 chassis that I had. As 3d printer that was quite outdated, but the motion platform was sturdy and reliable.
I re-used most of the carriage design from the first version. I added a GoPro fixture, so I can mound an LED light on the carriage itself instead of the side of the machine. In theory this should provide more consistent illumination for the camera.
I was also not happy with the fume exhaust design on the V1. It was using a small 40mm fan that was very noisy, the carbon activated filter piece was very small and it looked very ugly.
For the V2 I decided to put the fan and filter on top of the machine, next to the solder wire motor/extruder. It took quite a bit of experimentation to find the right hose to connect the two. I tried thin silicone hose, that was too thin and the walls would collapse during movement. I tried thicker vinyl hose but that was too rigid and would obstruct the movement of the head. Finally I settled on a corrugated PVC hose – it is flexible enough and would not collapse on it own.
The other experiment was to find what size fan I should use. I tried 60mm, 70mm and 80mm axial fans but they would not provide sufficient airflow, when the filter mount was attached. I finally settled on a 7035 centrifugal fan. I started with 120mm centrifugal fan, but that was too big and loud.
Here is a video of the fume exhaust system in action: