Alunar M508 (also Infitary) ball bearing spool holder TUSH-style

A remix of Soeren_Stobbe's really clean design, resized to fit onto the Alunar M508. I believe the Infitary M508 is the same printer, so it should work there as well.

You'll need four (4) 608ZZ bearings. No screws or any other hardware is needed.

Modifications to the original design:

1. Size. The Alunar main frame is 90mm high and is 28.5mm between the front of the frame and rear LCD acrylic panel. This is design to 'rest' on that acrylic frame behind the LCD panel electronics.

2. Split the main support and the snap-in side.

3. The snap-in side has a protrusion that 'snaps' into the main support. It is a VERY tight fit with only 0.1mm tolerance. I used a rubber mallet to tap them into place.

4. Some additional width on the main supports, 6mm thick instead of 5mm in the original design.

5. Bottom protrusion, which sits underneath the frame, is a little longer.

This was completely designed from scratch in Fusion 360 using Soeren's 123D as a reference.

Also thanks to filamentary for the TUSH spool holder design...such a clean, stylish, and functional design.