SPANNERHANDS small volume remix

Update 2019.8.6
- added windowed versions of the full lids (thin and 1kg). Get the base models from original Spannerhands thing

Update 2019.1.28
- update base and lid models: ears are better optimized for printing
- BASE2: change form, requires less material
- added universal 1kg and 750g core, uses 608 bearings
- added lip model, to be used inside the container. I've had some problems with some spools unraveling inside the box, this should help with it
- more rigid bolt

Update 2018.12.29:
- properly aligned the models so the brackets should align better now
- added thin bases and lids. NOT tested yet, but looks good on preview
- added 16mm and 20mm cores, for small spools like Taulman nylon. Needs the SMALL_CORE_bearing and SMALL_CORE_axle
- TODO:
* universal core to replace all the ~50mm+ cores
* way to stop filament from unfolding from the spool and causing jams

Update 2018.3.22:
- add new lid2 windowed version with the window frame part. I've printed it my