This is a set of inserts for the Newton boardgame published by CMON (box internal dimensions are: 306mm x 214mm x 68mm). Everything should fit snugly inside the box. The card slots are big enough to support sleeved cards (I use MayDay standard sleeves - not premium ones). There are slots for all tokens except the Apple first player marker. I just put that in the money token holder.
Note, you'll need to print 4 of the player marker boxes (PlayerMarkers_fixed.stl).
UPDATE (2019/07/23) - It seems that recent prints of Newton have thicker cardboard stock. So I've increased the width of slots to account for 2mm thick cardboard. The updated files end with xyz_v3.stl. Note that I have not personally printed these.
UPDATE (2019/02/11) - Added extra finger dishes to the book tokens slots on the player marker pot (Player_Markers_fixed_v2.stl).
UPDATE (2019/03/03) - Incorporated tvkili's remix (https://www.thingiverse.com/thing:3450016).
Das Filament PLA
As always, ensure your printer is well calibrated.
I also print with a 3-5mm brim to minimise/prevent corner lifting.