Thas sounds very strange to me. I use the same and totally no dust escapes from the big sucker.
Can your problem be caused by the upperside of the sawdeck? Do you blow the sawdust away there or also use suction?
Edit: nm, i see you have a big suctionpipe on top.
What you need on your Hegner is this:
Then connect te vacuumcleaner to it and it works like a charm!
It is also possible to mount the blowhose there so it sucks also from the top.
Li-ion batteries get stuck when discharged to far, Thats one problem. You can simply kill the battery with a light connected and leave it till the light is off..
And a not carefully used Li-ion battery can burn like hell!
And my last advice: Get Pegas sawblades! The difference with many others is that they do saw in a straight direction.
For most of my projects i use No 5 skip reverse blades, but sometimes i use a lower number.
Sounds great!
Have a lot of fun with it and keep experimenting.
I forgot one important tip: If the scrolling goes to fast then you can go for a less agressive blade and/or a lower number.
Example: Skip tooth blades are more agressive as regular blades.
True, Hegner says you need a complete new motor for variable speed.
And the Cumquats part is that every cheap ass Aldi or Lidl scrollsaw has the variable speed!