Filament stand Prusa i3 MMU Version 2

This is a upgraded version of the original version https://www.thingiverse.com/thing:2787770

I've added 4 additional spool holders to the lower part of the frame. This was possible when lifting up the filament spool holders by distance pieces of 70mm.

The thingiverse files here only contains the upgrade of original version https://www.thingiverse.com/thing:2787770 to get this current version.

This means:

1. Distance pieces for lifting all 4 upper spools by 70mm
2. New filament guides that guide the filament from the top and the bottom.
3. All spool holder parts for the lower 4 spools.
4. Improved version of the Bolt (Filament spool center rod)

Additionally required:

• 10 T Nuts M4 https://www.aliexpress.com/snapshot/0.html?spm=a2g0s.9042647.6.1.YQKrEu&orderId=505246412960296&productId=32706324351
  for mounting the new bottom holders
• 10 Square M4 nuts for mounting the upper holders distance pieces again
• 10 M4x16mm screws for mounting the upper holders distance pieces again
• 4 pc. PTFE tube ø4 x 20mm for the lower filament guiding.

This new version also doesn't require the 5mm space pieces mentioned in the add-on section of the original version.