Modified Secret Heart Box

thingiverse

A slight adjustment from the Secret Heart Box involves adding a shelf along the inside cleave line on the top layer, thus avoiding filament pullout if initial filling isn't in the X direction. My worst problem for the original Secret Heart box was bridging on the top piece, particularly when printing with PLA and aggressive cooling that works well. I wanted to make ABS work too, but one issue remained: the ABS strand along the cleave line got stretched by the first layer fill for both upper and lower sections. One solution is using a slicer that fills in Y and X directions as shown by Emmett's example. However, my current slicer insists on a 45-degree top fill, dragging filament out of sorts. I dislike having to pick between slicers for various builds, so instead I added a small shelf along the inside top cleave line allowing top layers to fill in any direction once hardened enough for the fill layer. This worked perfectly without supports! It was my first time using SCAD and Emmett's ingenuity stunned me with his clear spatial reasoning. Print Settings: Printer: Flashforge Creator Pro Rafts: No Supports: No Resolution: 0.4mm Infill: N/A Notes: This works best when printed with a single shell defined in the STL file, using a layer setting of 0.25mm. How I Designed This: SCAD mods: Added shelf definition to the SCAD file in the hollowbase module. The original design is extremely clever and well done.