Created after downloading the 1kg hopper from Lancashire3D (thanks!) https://www.thingiverse.com/thing:3882980
Simple sieve to stop stuff going in the machine hopper bigger than about 4mm and clogging your machine if you miss it on the first sieve through.
Simply sits inside the 1kg hopper and can easily be removed. Depending on the size of your scraps you may wish to do so as sometimes it needs some help to get stuff through, but I thought better be safe than sorry :)
Print at 98% size (depending on shrinkage for your filament brand), 70ms, mesh down, no nothing.