SAMLA HANGA (modified version)

The SAMLA HANGA by jangreve has a very nice design. But some weak points were the motivation to do the following changes:
* Some enforcements have been added to avoid breaking at mounting frame and at the beginning of the triangle.
* I formerly used a 40mm tube but this has some more friction. When changing to a smaller aluminium tube, the filament was hanging quite low. Now the angle of the triangle has been increased. If you change the diameter of the tube, the height of the filament will not change so much anymore.